One Horse Trailer Wheel Locks Up Even with Brake Controller Power Set Low

Updated 02/18/2013 | Published 02/14/2013

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Dexter Electric Trailer Brake Assembly - 12" - Right Hand - 6,000 lbs

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Question:

hi! I have a tandem bumper pull horse trailer with electric brakes. Everything was working fine until one day Ive noticed that when when I brake one of the wheels lock up. I was trying to adjust the dial on the control box in my truck but even on the minimum setting the wheel was locking up immediately. Any suggestions what could be the problem? Thanks much.

asked by: Greg

Expert Reply:

If the brakes were working fine then I believe that there is an electrical problem of some kind that is causing excessive power draw making the brake lock up.

First you will want to check the vehicle and trailer side connectors for dirt and corrosion. Corrosion can also build up at the backs of the connectors where the wires attach. Then check the wiring going to the brake magnets. Look for any nicks in the wiring that may be touching the metal of the trailer frame. Make sure that the ground wires for the magnets are attached to clean and corrosion free bare metal surfaces.

Next check the magnets for wear. If you can see the windings coming through then the magnets will need to be replaced. Beyond that you can check the magnets using a multi-meter like # PT89ZR. Then follow the FAQ I have linked to test the magnets.

expert reply by: Michael H