Passenger Side of Trailer Brakes Work But Drivers Side Does Not

Question

Question:

first how can I determine if electricity is flowing to drivers side on my Single axle 2010 Casita trailer. When the brake is engaged the passenger side receives electric and engages but the drivers side appears not too. I have no error message on my Prodigy brake controller. Brake lights all work just not the magnet on the drivers side brake. Help!!!

asked by: Ron

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Expert Reply:

It sounds like the driver's side may have a bad ground in the system or a loose ground. You can use a circuit tester, like # PTW2993, to probe the wires going to the driver's side brakes to see if voltage is reaching those brakes. You will want to make sure all brake magnet grounds are ran back to the main trailer ground and not grounded at the frame by each brake assembly.

I have linked a video that shows how to test trailer brake magnets for proper function.

expert reply by: Chris O

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Answer 1

Trailer brake magnets actually are not polarity sensitive. That means either wire lead can be the positive as long as the other wire is grounded.

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Answer 2

Yes, the brake magnets should engage when pulling a properly wired breakaway switch pin. If the brakes aren't locking up on your trailer when pulling the pin then I recommend making sure the power source (battery) for the switch is fully…

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Answer 3

To wire your electric brakes you will want to run 10 gauge wire #10-1-1 to one of the brakes and run it to the other brake, using butt connectors like #05732-2 to connect them. The grounds will not be spliced, each brake assembly should have its…

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Answer 4

It sounds like the left side may have a bad ground in the system or a loose ground. I would check over the complete wiring system and make sure all grounds have a good metal contact and no rust. Also check the wires to make sure the protective…

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Answer 5

If your trailer has 7 wires running all the way back to the brakes, then yes, you can tap into the existing wiring. Each of your new brakes will have two wires for the brake magnet. One wire is for 12 volt power to the brake magnets and the other…

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Answer 6

The wires exiting the rear of your controller serve the following functions. The blue wires carries the brake output from the controller, the white wire is the ground, the black wire supplies 12 Volt power, and the red wire is tied into the vehicle…

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Answer 7

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 8

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 9

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

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Answer 10

You will first want to check the fuses on your tow vehicle. Some vehicles could have fuses for operating the turn signals and brake lights of a towing package. You will want to check if they are installed and working properly. The next thing is to…

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

There are many things that can affect the voltage on the brake output wire from your brake controller to your trailer brakes such as the power setting on your brake controller, how you are testing the wire and if you are testing it with the brakes or…

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Passenger Side of Trailer Brakes Work But Drivers Side Does Not

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