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Troubleshooting Horse Trailer Wiring Where Brakes Lock Up Immediately  


I have a 2006 Dodge Ram 3500 and a 99 Sundowner Horse Trailer that I can not get to play nice with each other. Trailer works on other peoples vehicles. One way the brakes locked up on the trailer and everything else works. Rewired and brakes arent locked up but have no running lights or brakes. Have wires out of trailer colored red, yellow, green, white, brown, blue. No black. Have replaced plug, plug inlet, brake controller and checked fuses. So....Im at a loss.


Expert Reply:

Horse trailer wiring is funny as there's two different ways the standard 6-ways can be wired with the only real difference being the brake output circuit and the 12 volt accessory circuit being swapped. What would have solved your problem initially is if you had swapped those two circuits on your Dodge Ram 6-way initially before messing with the other circuits.

If you check out the picture I attached it would be swapping the blue and black wires.

expert reply by:
Jameson C
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