Can Manual and Self-Adjust Brakes be Used Together on Trailer or Will it Cause Brake Control Error  

Question:

Expert Reply:

There is only a mechanical difference between manual and self-adjusting electric trailer brakes so mixing the 2 types on 2 different axles would not cause the brake controller error. I would recommend sticking with one time of brake system though; otherwise you would have to be vigilant about adjusting the manual ones so that they provide the same braking performance as the self-adjusting ones.

The error on the brake controller could be caused by a poor connection on the output wire to the trailer brakes. What you can do is use a meter such as # PT89ZR to test for voltage at the trailer connector while someone applies the manual override on the brake controller.

If the voltage holds basically steady then the problem is not likely on the truck. But if it suddenly drops or cuts off completely then there is a problem on the truck side. A dirty/corroded vehicle or trailer side connector could cause this, a loose connection in the wiring between the controller and the trailer connector, a problem on the brake controller red input wire, or something inside the controller.

If could also be the wiring on the trailer or the magnets themselves. Inspect the power wires to the magnets and look for pinched, frayed, or damaged wires and fix as needed. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces.

You can visually inspect the magnets and if you can see the copper windings coming through the magnets will need to be replaced. To further test the magnets you can follow the help article I have linked. I have also included some help articles on testing and troubleshooting brake controllers for you.

expert reply by: Michael H

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