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How to test trailer brakes with a multimeter

As a trailer owner, you understand the need for your brakes to work properly.

Electric trailer brakes are common with the more contemporary medium-duty trailers, and these come with diagnostic issues of their own.

Your problems go beyond rust or a buildup of deposits around the drum area.

A fault with the electrical system also means your brakes don’t function properly.

However, not everyone knows how to diagnose a problem here.

Our article presents you with all you need to know about testing electric brakes for trailers, including how to simply run diagnostics on electrical components using a multimeter .

Let’s get right in.

how to test trailer brakes with a multimeter

How To Test Trailer Brakes With A Multimeter

To test trailer brakes, set your multimeter to Ohms, place the negative probe on one of the brake magnet wires, and place the positive probe on the other magnet wire. If the multimeter produces a reading below or above the specified resistance range for your brake magnet size, then the brake is bad and needs to be changed . 

This process is only one method of testing individual brakes and these steps, as well as other methods, will be explained further.

There are three ways of testing your brakes for problems:

  • Testing resistance between brake wires
  • Testing amperage from the brake magnet
  • Testing current from the electric brake controller

Testing Resistance Between Brake Magnet Wires

  • Set Multimeter To The Ohms Setting

To measure resistance, you set your multimeter to Ohms, which is usually represented by the Omega symbol (Ω). 

  • Position Multimeter Probes

There is no polarity between your brake magnet wires, so you can place your probes anywhere you want.

Place your black probe on any of the brake magnet wires and place the red probe on the other wire. Check for readings on your multimeter.

  • Evaluate Results

With this test, there are certain specifications you want to note down. 

For a 7-inch brake drum, you expect a reading between 3.0 – 3.2 ohms, and for a 10 – 12-inch brake drum, you expect a reading between 3.8 – 4.0 ohms. 

If the reading you get from your multimeter is outside these ranges as they relate to your brake drum size, then the magnet is bad and needs to be replaced.

For instance, the multimeter presenting “O.L” indicates that there’s a short in one of the wires and the magnet probably needs to be changed.

Testing Amperage From Brake Magnet

  • Set Multimeter To Measure Ampere

The first step is to put your multimeter on the ammeter setting. Here, you want to measure if there’s any internal exposure or breaks in the wires.

Pay attention to these positions. Place the negative probe on any of your wires and place the positive probe on the positive terminal of your battery.

You then place the brake magnet on the negative battery post.

  • Evaluating Results

If you get any ampere reading from the multimeter, then there is an internal short in your brake magnet and it needs to be replaced.

If the magnet is good, you don’t get a reading from your multimeter.

If you have hard time finding right wire check this guide .

Testing Current From The Electric Brake Controller

Electric brakes are managed by an electric brake control panel.

This panel feeds the magnets with electric current when the brake pedal is pressed, and your vehicle stops.

Now, a problem with your brakes arises if this electric brake controller isn’t working properly or current from it isn’t adequately reaching your brake’s electromagnets.

To test this device, there are four methods.

You can use a multimeter to test the trailer brake wiring between your brake controller and the brake magnet. 

When generally testing brakes for problems, you want to take note of certain things.

These are the number of brakes you have, your trailer pin plug configuration, and the recommended current the magnet wires are meant to produce.  

This recommended current is based on the size of the magnet, and here are the specifications to follow.

For Brake Drum Of 7″ Diameter

  • Trailers with 2 brakes: 6.3 – 6.8 Amps
  • Trailers with 4 brakes: 12.6 – 13.7 Amps
  • Trailers with 6 brakes: 19.0 – 20.6 Amps

For Brake Drum Of 10″ – 12″ Diameter

  • Trailers with 2 brakes: 7.5 – 8.2 Amps
  • Trailers with 4 brakes: 15.0 – 16.3 Amps
  • Trailers with 6 brakes: 22.6 – 24.5 Amps

trailer brake recommended current

Now, follow these steps.

Set your multimeter dial to the ammeter settings

Connect one probe to the blue wire coming from your connector plug and the other probe to one of your brake magnet wires.

  • Take Reading

With your car powered on, activate the brakes through the pedal or electric control panel (you can have a friend do this for you). Here, you want to measure the amount of current coming from the connector to the brake wires.

Using the specifications mentioned above, determine whether you are getting the right amount of current or not.

If the current goes above or below your recommended specification, then the controller or wires may be bad and need to be changed 

There are also other tests you could run to diagnose the current coming from your electric brake controller.

In case you see smaller values while measuring the amperage, take a look at this text how milliamps look on a multimeter .

Compass Test

To run this test, simply apply electric current to the brakes through the controller, place the compass near the brakes, and watch if it moves or not. 

If the compass doesn’t move, then current isn’t being supplied to the magnets and there could be a problem with your controller or the wires.

Magnetic Field Test

When current is applied to your electronic brakes, a magnetic field is created and, expectedly, metals stick to it.

Look for a metal tool like a wrench or screwdriver and let your friend apply current to the brakes through the controller.

If the metal doesn’t stick, then there could be a problem with the controller or its wires.

Trailer brake test

Trailer Connector Tester

You can make use of a trailer connector tester to check whether your different connector pins are working.

Of course, in this case, you want to check that the pin for the brake connector is receiving current from the controller. 

Simply plug the tester into your connector plug and check whether the appropriate light for brakes comes on.

If it doesn’t, then there is a problem with the controller or its wires and these need to be checked and replaced. 

Here is a video on how to operate a trailer connector tester.

There are multiple ways of making a diagnosis on why trailer brakes are not working. We hope we have helped you successfully with this guide.

We highly recommend you to take a look on guide about testing trailer lights .

Frequently Asked Questions

How many volts should trailer brakes have.

Trailer brakes are expected to produce between 6.3 to 20.6 volts for a 7-inch magnet and 7.5 to 25.5 volts for a 10 – 12 inch magnet. These ranges also differ based on the number of brakes you have.

How Do I Check The Continuity Of My Trailer Brakes?

Set your meter to ohms, place one probe on one of your brake magnet wires, and place the other probe on the other wire. An “O.L” reading indicates that there’s a shortage in one of the wires.

How Do You Check Electric Trailer Brake Magnets?

To test a brake magnet, measure the amount of resistance or ampere coming from the brake magnet wires. If you get an ampere reading or O.L resistance reading, there’s a problem with it.

What Would Cause Electric Trailer Brakes Not To Work?

A trailer brake may not work properly if the electrical connections are bad or the brake magnets are weak. Use a meter to test for resistance, voltage, and ampere within the magnet and wires.

How to Check Electric Brakes on a Trailer?

Checking electric brakes on the trailer commonly starts with checking the actual brake controller for faults. If nothing is wrong with your brake controller, you will need to look for wiring problems and shorts within the brake magnets themselves.

Whether you are towing a heavy load or driving up and down dangerous mountain roads, you really need to have good, reliable brakes. If you suspect some kind of brake problem, clear it up RIGHT AWAY, before you get on the road and expect them to work the way they are supposed to!

Your problem could be as simple as replacing a worn-out brake magnet or as hard as getting rid of frayed wires and rewiring the whole thing. Emergencies happen and need to be taken care of, but you should always do preventive maintenance on your brakes (usually once a year or 12K miles), in order not to be stuck in a situation like that.

In this article I will go over:

  • How to check your brake controller.
  • How to check your brakes with a multimeter and brakeforce meter.
  • How to test your trailer’s plug.
  • Some visuals of wear and tear.
  • The common reasons for shorts.

First of all, let’s take a look at how our trailer’s brakes work:

travel trailer brake tester

How to test an electric trailer brake controller

Now, let’s take a look at your Electronic Brake Control Panel, and if you have one of the models with a screen (paid link), you will be notified of a problem:

travel trailer brake tester

The controller of a trailer’s electrical brake system is a device that feeds the current to your electric brakes. When the brake pedal in your tow vehicle is being pressed, the electromagnets in the brakes themselves get activated and your trailer stops.

This magnetic action of the brake controller could be checked in the following ways:

1. Compass test

Simple, primitive, but useful! Not sure if you have a compass handy, (I do, and I don’t even know why), but here is a simple test for you.

Use the controller to apply power to the brakes (you may require a friendly face to assist you with this task) and put your compass near the brake itself. The compass is supposed to spin if it doesn’t, your brakes are not getting needed electricity in order to work.

If the test failed and the compass is not spinning, checking wires and connections for damages is recommended. Even though this test is kind of fun, not many people own a compass these days, so if you have a screwdriver or a wrench handy, I have an even simpler test for you!

2. Wrench test

Metallic objects are supposed to stick once the electromagnetic field is activated. You can also notice the amount of force applied if your wrench (or another metal object) is sticking well or so-so.

Once you activate your brakes via the controller, if your wrench sticks to them, that means that they are working fine. If not, once again, your connections and wiring need to be checked.

Here is an example:

travel trailer brake tester

3. The light bulb test

A light bulb could also be used to check if everything is fine with your brake controller. Here is a good video on that:

travel trailer brake tester

These tests will not give you exact numbers, but you will get an idea of what is happening to your brake controller. In order to do further troubleshooting of your brakes, you may need specialized tools or just take them to the shop.

Here is a nice 5-star electronic brake controller (paid link) sold on Amazon.

Using the b rakeforce meter tester

There is also a tool available, called Electric Brake Force Meter . It can simulate your load and let you know how your trailer should be responding once a brake pedal is pressed.

Below is a video of a person troubleshooting his brake problem using this very tool:

travel trailer brake tester

If you like, you can also purchase this electric Break Force Meter (paid link) which is conveniently sold on Amazon:

Testing the plug of your trailer

There could be a problem with getting a good connection between your tow vehicle and a trailer. If there is corrosion or debris inside the pins of your plug, the power may not get to your breaks at all!

Here is how you test your 7-pin trailer plug for faults:

travel trailer brake tester

Testing your brake system with the trailer connected

If everything seems fine with your brake controller and you still have a brake problem, there could be some wiring or connection problems. You can test the connection between the brakes and the brake controller with a multimeter.

When figuring out how much power your brakes require, you will need to know the size of the brakes and how many of them you have. It is common for a trailer to have two brakes (one for each axle). If you have more than one axle, add your brakes accordingly.

You will need a fully charged 12-volt battery for this test and knowledge of basic 7-pin trailer plug configuration:

Connect your blue wire (which is the one that controls brakes) to the multimeter with an ammeter setting between the brake controller and trailer connector. You should be getting at maximum:

Brake diameter 10-12″

  • 7.5-8.2 amps with 2 brakes
  • 15.0-16.3 amps with 4 Brakes
  • 22.6-24.5 amp usage with 6 brakes.

Brake diameter 7″

  • 6.3-6.8 amps with 2 brakes
  • 12.6-13.7 amps with 4 Brakes
  • 19.0-20.6 amp usage with 6 brakes.

If your reading is more (or less) than the above numbers, you should check individual brakes for problems. Make sure that this time your trailer is NOT connected:

  • Test #1. Put your multimeter on an ammeter setting and connect it between the positive terminal of a 12-volt battery (positive lead) and any of the brake magnet wires (doesn’t matter which one). The second magnet wire should be connected to the negative terminal of the battery. If your reading is anywhere below or above 3.2-4.0 amps for 10-12″ brake magnets or 3.0-3.2 amps for 7″ brake magnets, replace your brake magnet.
  • Test #2. Put your multimeter (negative lead) in between any of the brake magnet wires and the positive terminal of the battery. Touch the negative terminal of the battery with the base of the brake magnet, and if you get ANY kind of amperage reading on the multimeter, then your brake has an internal short. In this case, also, the brake magnet needs to be replaced.

If your brakes don’t pass any of these tests, start looking for loose wires and corroded connections. Information reference here .

Visual check for general wear and tear

This is what a normal brake magnet looks like:

The wear and tear of the brake magnets themselves could be an issue. Here are some examples of bad wear and tear:

If the wires are showing through, it is considered to be “extreme or excessive wear and tear”:

Checking for wiring shorts

Frayed or damaged wiring is also a big issue, due to the wire placement within the axle itself. If you get an indication on the brake controller screen “Output Shorted”, start looking at wiring problems within your axle:

** Warning! Working with electricity and wires is EXTREMELY dangerous and if you don’t know what you are doing, get professional assistance.

** Important! This information is NOT a replacement for regular trailer inspections which are required by law.

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Attention! This article is for informational purposes ONLY and is NOT a replacement for professional advice! ALWAYS consult your local specialist for an appropriate solution to your problem. All statements, prices, contact information, recommendations, and reviews contained herein came from sources that we believe to be reliable, but the accuracy or completeness thereof is not guaranteed. Please contact the service provider for complete details and updates.

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  • Towing Electrical
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  • 7-Way RV Blade Trailer Brake Controller Tester

7-Way RV Blade Trailer Brake Controller Tester #51498

  • Perfect for installing and troubleshooting tow vehicle / trailer wiring systems
  • Tests vehicle wiring for battery voltage, brake voltage and signal circuits
  • Volt meter indicator measures tow vehicle and electric brake voltage
  • Current meter uses magnets to measure brake controller output without a trailer
  • Includes a 20' cable for easy, single-user, in-cab testing
  • Constructed with durable components for long life and dependability
  • Can be used for two-axle or three-axle trailers

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Reviewed by 1 Customers, Please Share your thoughts.

Guides & Install Sheets

  • Installation Sheets Download

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Product specifications.

  • Hub Warehouse D01
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  • Part Type *
  • Shipping Weight 12.000
  • Warranty One-Year Limited Warranty

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

For any type of trailer, part of towing responsibly is making sure your trailer lights are working properly. With heavy-duty trailers, such as a large boat trailer or 5th wheel camper, that responsibility is even greater. Giving safety its proper priority is easy with the CURT 7-way RV blade trailer brake controller tester. This sophisticated towing electrical tester plugs into any 7-way RV blade socket and allows you to check your vehicle wiring for battery voltage, brake voltage and signal circuits.

The CURT 7-way RV blade brake controller tester accurately measures the brake and battery voltage output at your 7-way connector. It features a volt meter and a current meter for testing brake power and allows you to test the power output of your trailer brake controller unit. The 7-way brake controller tester can be used for trailers with two or more axles, and because it uses a special magnet system, brake controller output can be measured even without a trailer attached. It includes easy-to-follow testing instructions and a 20' cable for single-user, in-cab testing to make it even easier to get to the bottom of any electrical problem.

Operating the CURT 7-way RV blade electrical tester is simple and does not require an additional power source. Simply plug the 7-way RV blade into your vehicle's electrical socket, select your settings with the axle and voltage switches, and you are ready to begin. The tester is able to check your left and right turn signals, brake lights, tail lights and reverse lights if applicable. It also provides the voltage and current of your vehicle's brake controller output. The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller.

The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers, and gives you the peace of mind to Bring It on any towing adventure.

BY: Mitchell T Lloyd

Tester works great but the cable comes out the right side, needs to come out the left side of the tester. When sitting in the driver's seat to activate controls, the cable is in the way and has to pass across the driver. Otherwise a great product.

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7-Way RV Blade Trailer Brake Controller Tester #51498

Description.

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travel trailer brake tester

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For any type of trailer, part of towing responsibly is making sure your trailer lights are working properly. With heavy-duty trailers, such as a large boat trailer or 5th wheel camper, that responsibility is even greater. Giving safety its proper priority is easy with the CURT 7-way RV blade trailer brake controller tester. This sophisticated towing electrical tester plugs into any 7-way RV blade socket and allows you to check your vehicle wiring for battery voltage, brake voltage and signal circuits.

The CURT 7-way RV blade brake controller tester accurately measures the brake and battery voltage output at your 7-way connector. It features a volt meter and a current meter for testing brake power and allows you to test the power output of your trailer brake controller unit. The 7-way brake controller tester can be used for trailers with two or more axles, and because it uses a special magnet system, brake controller output can be measured even without a trailer attached. It includes easy-to-follow testing instructions and a 20' cable for single-user, in-cab testing to make it even easier to get to the bottom of any electrical problem.

Operating the CURT 7-way RV blade electrical tester is simple and does not require an additional power source. Simply plug the 7-way RV blade into your vehicle's electrical socket, select your settings with the axle and voltage switches, and you are ready to begin. The tester is able to check your left and right turn signals, brake lights, tail lights and reverse lights if applicable. It also provides the voltage and current of your vehicle's brake controller output. The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller.

The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers, and gives you the peace of mind to Bring It on any towing adventure.

  • Perfect for installing and troubleshooting tow vehicle / trailer wiring systems
  • Tests vehicle wiring for battery voltage, brake voltage and signal circuits
  • Volt meter indicator measures tow vehicle and electric brake voltage
  • Current meter uses magnets to measure brake controller output without a trailer
  • Includes a 20' cable for easy, single-user, in-cab testing
  • Constructed with durable components for long life and dependability
  • Can be used for two-axle or three-axle trailers

Specifications

  • Installation Instructions (PDF)

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Model # 51498, store sku # 1003449544, 7 way function test box.

CURT 7 Way Function Test Box

  • Perfect for troubleshooting tow vehicle and trailer wiring
  • Includes a 20' cable for easy, single-user, in-cab testing
  • Can be used for two-axle or three-axle trailers
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Product Details

About this product.

This CURT towing electrical tester plugs into any 7-way RV blade socket and allows you to check your vehicle wiring for battery voltage, brake voltage and signal circuits. It features a volt meter and a current meter for testing brake power and allows you to test the power output of your trailer brake controller unit. The 7-way brake controller tester can be used for trailers with two or more axles, and because it uses a special magnet system, brake controller output can be measured even without a trailer attached.

  • Perfect for installing and troubleshooting tow vehicle / trailer wiring systems
  • Tests vehicle wiring for battery voltage, brake voltage and signal circuits
  • Volt meter indicator measures tow vehicle and electric brake voltage
  • Current meter uses magnets to measure brake control output without a trailer
  • Includes a 20 ft. cable for easy, single-user, in-cab testing
  • Constructed with durable components for long life and dependability
  • Click here for more information on Electronic Recycling Programs
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travel trailer brake tester

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Heavy ranger mutt® (7-way round pin) mobile universal trailer tester.

9102_Product_w_Box

Commercial-type trailer light and electric brakes tester that allows the user to perform all testing functions without the use of the vehicle.

To locate a distributor near you, please call 888-786-7899 or email us here .

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Description

  • Reviews (21)
  • Specifications
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Test the Trailer Without the Truck!

The Heavy Ranger Mobile Universal Trailer Tester (MUTT®) is a commercial trailer light and electric brakes tester that reduces guesswork and saves time by powering each trailer electrical circuit in 7-way round pin arrangements. This allows for proper verification of wiring configuration, ground integrity, short circuit and overload conditions, along with electric brake operation and turn signal simulation. The Heavy Ranger MUTT® features a water resistant, rugged design and features an internal battery compartment and external 12v power port which can be used as a memory saver, test light supply or trickle charge input.

Features and Benefits:

  • Test 7-way round pin trailer side harnesses
  • Short circuit protection
  • Turn signal simulation and power verification LED
  • Water resistant
  • Internal battery compartment (battery not included)

• 500mA Battery Charger (#CHR0001)

travel trailer brake tester

21 reviews for Heavy Ranger MUTT® (7-Way Round Pin) Mobile Universal Trailer Tester

Brad D Boyd (verified owner) – October 20, 2023

GREAT FOR MOBILE APPLICATIONS ON THE YARD OR OUT IN THE FIELD. VERY HANDY FOR DOT/FEDERAL INSPECTIONS IF NO TRUCK IS AVAILABLE TO FIRE UP THE TRAILER WHEN PERFORMING AN INSPECTION.

Adam w. – August 25, 2020

works good for trailer business Ok

mjwarren2000 – March 11, 2020

Good tester As advertised, easy to use, heavy duty. Have to supply your own battery.

Mark Ellis – February 13, 2020

Makes testing the electrical on a trailer go faster. Works great,

William Scott Gable – January 29, 2020

User friendly Plastic materials used

Richard – January 15, 2020

Compact I use it to test trailer lights, love it

Steve Moats – November 7, 2019

Clinton Place – August 20, 2019

Good deal! Wish it would have came with the battery and charger.

Jose Colon – June 19, 2019

Great Tool Excellent, a must have if you own a trailer…….Its works great

wanda schumacher – May 3, 2019

Money Well Spent!!!!!!!!!!! This tool is money well spent. It is easy to use and works as well as they say, compact and ready to use when I need it. After buying this for my personal use my company (who was impressed with it) bought 5 more for our service trucks to use.

James S. – April 15, 2019

Name brand. Very high quality. Best purchase ever Best thing I’ve ever bought off of Amazon

robinp8818 – January 26, 2019

kids kids love it

Shane Hainstock – January 10, 2019

Great tool! Used it several times for yard checks and roadside and never let me down.

a & d – August 29, 2018

VERY NICE Works real good, saved me a lot of time

craig – August 2, 2018

great product. Made in the USA great product . Made in the USA,, if you have a commercial trailer you need this. battery extra,, walmart or similar..

TwdPsychox1 – July 21, 2018

Really really light and requires a battery Works perfect!!

bryanbohland – April 24, 2018

Five Stars easy way to check trucks and trailers quickly.

Amazon Customer – January 27, 2018

It absolutely met my expectations. I use it almost … It absolutely met my expectations. I use it almost every day. It’s very portable and allows you to to Isolate circuits

David – December 3, 2017

Five Stars Buy it and save time and money

Marsha N. – September 1, 2017

Five Stars Works

James G Gobert – April 7, 2017

Five Stars Great product!

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#9101 and #9102 Ranger MUTT

Connection Type: 7-Way Round Pin Power Input: 12V DC Battery Required: Yes Battery Dimensions: L: 6" W: 4" H: 5" (Yuasa: YTX14 or similar) Output: 10A @ 12V DC Overload Protection: Automatic Resetting Internal Breaker Controls: Manual Control Knob Materials: ABS Material: ABS Package Weight: 2 lbs. (empty) Package Dimensions: L: 14" W: 8" H: 10" Warranty: 1-Year Limited Warranty CoO: USA

7-Way Round to 7-Way Flat Adapter

travel trailer brake tester

$ 55.95

500Ma Battery Charger

travel trailer brake tester

$ 20.00

12 Volts DC Battery

travel trailer brake tester

$ 94.50

Ranger MUTT® Knob

travel trailer brake tester

12V Flasher Relay

travel trailer brake tester

7-Way Round Zinc Socket

travel trailer brake tester

$ 27.95

Cigarette Socket Charging Port

travel trailer brake tester

$ 10.95

Ranger Power Switch

travel trailer brake tester

#9102 Sell Sheet

Ranger mutt manual, mutt comparison chart, heavy duty trailer tester catalog, related products, mobile smart mutt® pro edition (7-way round pin) mobile universal trailer tester.

travel trailer brake tester

This Item Has Been Discontinued

Smart MUTT® (7-Way Round Pin) Mobile Universal Trailer Tester

travel trailer brake tester

$ 765.00

Tactical Trailer Tester Field Kit

travel trailer brake tester

$ 937.00

Light Ranger MUTT® (7-Way Spade Pin) Mobile Universal Trailer Tester

travel trailer brake tester

$ 231.95

HD Fleet Technician’s Electrical Terminal Maintenance Set

travel trailer brake tester

$ 155.95

Truck and Trailer Pin Master Cleaner Set

travel trailer brake tester

$ 121.00

7-Way Round Pin Connector Cleaners

travel trailer brake tester

$ 47.95

7-Way Round Pin Towing Maintenance Kit

travel trailer brake tester

$ 72.95

Multi Trailer Tester Jobber Pack

travel trailer brake tester

$ 157.95

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travel trailer brake tester

  • USA Manufacturer Since 1996
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  • 24-Hour Repair/Replace

travel trailer brake tester

Customer Reviews

  • "Works great. Now I can easily tell if it’s the trailer with the problem or the truck. Simple to use." Ricky May #9107A Review
  • “ Great product. Made in the USA. If you have a commercial trailer you need this.” Craig #9102 Review
  • “If you do a lot of trailer PM's or FHWA the Super Mutt is a real time saver and a must have.” Michael #9008 Review
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Trailer Tester

EVERYTHING YOU NEED IN TRAILER LIGHT & BRAKE TESTERS

Trailer testing equipment.

If you need commercial Trailer Light Testers , Trailer Brake Testers , Mobile Diagnostic Testing Equipment that is sturdy, straightforward and functional – and pays for itself in improved operating efficiency – you’ve come to the right place.

For more than 20 years, Square Wheel Industries has supplied Trailer Testers™ and Express Garage™ trailer testing equipment to assist in troubleshooting trailer light and brake systems to the trucking and RV industries. Our trailer testing equipment can be found in any size operation, from the assembly plants of some of our nation’s largest trailer manufacturers to a person running a mobile service truck out of his home.

Not familiar with our trailer light or brake testers? Be sure to check our FAQs , where we answer frequently asked questions; or click Documents , to go directly to our document library.

Our secure, online store is open 24/7. You can also order by phone during normal business hours at (610) 921-8561.

travel trailer brake tester

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travel trailer brake tester

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IMAGES

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  6. 7-Way RV Blade Trailer Brake Controller Tester-Curt-51498

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VIDEO

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COMMENTS

  1. Trailer Brake Tester

    Thousands of trailer brake tester reviews, same day shipping. Best trailer brake tester selection available. Easy online ordering or call Hwy A at 1-800-940-8924. ... Tekonsha 7-Way, RV-Style Tester for Brake Controllers - LED Test Lights - 6562. Retail: $68.61. Our Price: $ 50.92 (109)

  2. Amazon.com: Trailer Brake Tester

    CURT 51498 7-Way RV Blade Trailer Brake Controller Tester. 4.2 out of 5 stars 6. $506.55 $ 506. 55. FREE delivery Sep 22 - 27 . Only 4 left in stock - order soon. ... Brake Fluid Liquid Tester Pen, Brake Fluid Tester with 5 LED Indicators, Brake Fluid Liquid Testing Pen for DOT 3 DOT 4 DOT 5.1 Vehicle, Auto Tester Tool, Diagnostic Testing Tool ...

  3. How to test trailer brakes with a multimeter

    To test trailer brakes, set your multimeter to Ohms, place the negative probe on one of the brake magnet wires, and place the positive probe on the other magnet wire. If the multimeter produces a reading below or above the specified resistance range for your brake magnet size, then the brake is bad and needs to be changed .

  4. Testing Trailer Brake Magnets for Proper Function

    Testing individual brake magnets for proper function can be accomplished by severing the magnet wires and connecting the ammeter between the positive terminal of a 12-volt battery and one of the magnet wires; it does not matter which one. Then connect the other magnet wire to the negative battery terminal. Check the amperage. If the amperage is greater than the specified amount (see ...

  5. CURT 51498 7-Way RV Blade Trailer Brake Controller Tester

    The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller. The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers and gives you the peace of mind to Bring It on any towing adventure.

  6. RV Check Light & Electric Brake System Tester

    RV Check is a fast, easy, low-cost Light & Electric Brake System Tester. Visit Trailer Tester online to learn more about our trailer testers & equipment. 610.921.8561 [email protected]

  7. RV Check

    The RV check is a fast, easy, low-cost way to test RV lighting and electric braking systems. In addition to powering an RV trailer's lighting circuits for easy checking, your RV Check measures the current draw of the electric brake coils, and checks the break-away battery circuit. The unit is totally portable and completely self-contained.

  8. How to Check Electric Brakes on a Trailer?

    Test #2. Put your multimeter (negative lead) in between any of the brake magnet wires and the positive terminal of the battery. Touch the negative terminal of the battery with the base of the brake magnet, and if you get ANY kind of amperage reading on the multimeter, then your brake has an internal short.

  9. 7-Way RV Blade Trailer Brake Controller Tester

    The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller. The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers and gives you the peace of mind to Bring It on any towing adventure.

  10. STEELMAN PRO Bluetooth Trailer Tester, Conduct Brake Light and Turning

    CURT 58270 7-Pin RV Blade Trailer Wiring Towing Vehicle Socket Tester, Black. ... This tool can test brake lights, running lights, reverse lights, turn signals, and even electric trailer brakes and 12V charge lines. These helpful features allow you to quickly diagnose and fix the exact malfunction, which in turn keeps you and other drivers safe ...

  11. RV How To

    An RV how to project on how to check and care for the trailer brakes, something you should do every year.

  12. 7-Way RV Blade Trailer Brake Controller Tester #51498

    The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller. The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers, and gives you the peace of mind to Bring It on any towing adventure.

  13. Quick tip of the day: how to test trailer brake for function

    Watch this quick video to see how to test basic function of trailer brakes. This is just to see if the magnets activate and the shoes grab. It wont tell you ...

  14. 7-Way RV Blade Trailer Brake Controller Tester #51498

    The CURT RV blade tester also offers a number of potential causes of electrical failure, including fuse issues, inadequate wiring, damaged wires or a defective brake controller. The CURT 7-way brake controller tester is compatible with all CURT trailer brake controllers, and gives you the peace of mind to Bring It on any towing adventure.

  15. Electric Brake Tester

    Best electric brake tester selection available. Great prices, same day shipping, thousands of electric brake tester reviews. Easy online ordering or call Hwy A at 1-800-940-8924. ... Realistic logs of this electric fireplace gives your RV a homey look and feel. Adjust the temperature so the whole family can keep warm on a cold winter night, and ...

  16. How to Test Electric Trailer Brakes

    Make sure that your trailer is NOT hooked up this time: Test 1: Connect your multimeter's ammeter setting to the positive lead of a 12-volt battery and any of the brake magnet wires. It doesn't matter which one you choose. The negative end of the battery should be connected to the second magnet wire.

  17. How to Test a 7 Pin Trailer Connector with a Multimeter and

    My trailer lights and brake controller recently stopped working and I had to troubleshoot the problem. In this video, I show how to test the 7 pin trailer co...

  18. CURT 7 Way Function Test Box 51498

    About This Product. This CURT towing electrical tester plugs into any 7-way RV blade socket and allows you to check your vehicle wiring for battery voltage, brake voltage and signal circuits. It features a volt meter and a current meter for testing brake power and allows you to test the power output of your trailer brake controller unit.

  19. Heavy Duty Ranger MUTT® Trailer Light Tester

    The Heavy Ranger Mobile Universal Trailer Tester (MUTT ®) is a commercial trailer light and electric brakes tester that reduces guesswork and saves time by powering each trailer electrical circuit in 7-way round pin arrangements. This allows for proper verification of wiring configuration, ground integrity, short circuit and overload ...

  20. Electric trailer brake diagnosis

    I'll show you a few things to confirm your electric brakes are in spec and working like they should.

  21. Trailer Testing Equipment, Trailer Testers & Acessories @ Trailer Tester

    Trailer Testing Equipment. If you need commercial Trailer Light Testers, Trailer Brake Testers, Mobile Diagnostic Testing Equipment that is sturdy, straightforward and functional - and pays for itself in improved operating efficiency - you've come to the right place.. For more than 20 years, Square Wheel Industries has supplied Trailer Testers™ and Express Garage™ trailer testing ...

  22. How to Test Electric Trailer Brake Magnets to Determine if They Need to

    2 Brakes 5.6-6.6 7.5-8.2. 4 Brakes 11.3-13.3 15.0-16.3. 6 Brakes 17.0-20.0 22.6-24.5. Next, disconnect the negative wire from the brake magnet wire and connect it to the base, housing, of the brake magnet. If there is any amperage, the magnet is shorted and will need to be replaced. Finally, using an ohmmeter, check the resistance between the ...