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Horse Trailer Electric Brakes Lock Up When Backing Up the Trailer

Question:

Horse trailer has electric brake problem, When backing up, the trailer brakes block the tires. only when backing up does it. going forward it is fine. I have checked the truck system and it is fine.

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Expert Reply:

There could be a short in the truck or trailer side connector that occurs when the vehicle is put in reverse. The center pin is typically the reverse light circuit. You will want to make sure that the truck and trailer side connectors are clean and free of corrosion inside and out.

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.

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