Strange truck/trailer electrical problem.

Rory McNeil · 08-18-2014, 02:02 AM

Earlier this year I replaced my old ramp truck with a F350 dually and 24 foot Wells Cargo trailer. On Saturday morning I was all loaded up for a race, but when I was ready to leave home, as soon as I turned on my trucks headlights, the red light on the brake controller came on and the trailer brakes were engaged. Turned the lights off, and the truck would move, turn the lights on, and the trailer brakes locked up. When I unplugged the trailer harness from the truck, the controller light went out, and the brakes were released. I have used the truck and trailer before with no issues, so it can`t be anything wired up wrong, but I`m guessing power is being fed back thru the electrical system. Anybody experianced this before?

08-18-2014, 02:02 AM	#1
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,257 Likes: 245 Liked 940 Times in 259 Posts	Strange truck/trailer electrical problem. Earlier this year I replaced my old ramp truck with a F350 dually and 24 foot Wells Cargo trailer. On Saturday morning I was all loaded up for a race, but when I was ready to leave home, as soon as I turned on my trucks headlights, the red light on the brake controller came on and the trailer brakes were engaged. Turned the lights off, and the truck would move, turn the lights on, and the trailer brakes locked up. When I unplugged the trailer harness from the truck, the controller light went out, and the brakes were released. I have used the truck and trailer before with no issues, so it can`t be anything wired up wrong, but I`m guessing power is being fed back thru the electrical system. Anybody experianced this before? __________________ NHRA 6390 STK M/S 85 Mustang