Join Date: Oct 2012
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trailer wiring troubleshooting
We have a flatbed double axle trailer with electric brakes and 7 pin plug that we are trying to get the lights to work. when it is hooked up to my 99 f250 the brakes work and running, blinkers, and hazards work. but when the brake is pressed all of the trailer lights go out completely and turn back on when i let off the brake.
We also have a 07 cummins ram 3500 when it is hooked up none of the lights work at all. brakes work but no lights. we hooked the truck up to a 4 pin trailer with an adapter to the 7 pin and all lights work correctly and i even double checked the wiring at the truck with a volt meter. Next we hooked up the flatbed double axle trailer back up to the dodge and plugged the 7 pin connector in AND a seperate set of 4 pin tow light kit. Everything worked, the trailer lights, the seperate tow lights, and the brakes, but when the brakes were pressed the trailer lights would go out just like my ford. when the 4 pin tow lights were unplugged the trailer lights went out again.
wires we have on the trailer: BROWN (running lights) GREEN (right blinker) YELLOW (left blinker), there are no BLUE or WHITE wires on the trailer. the trailer brakes have a RED wire and BLACK wire going to them. from what i can tell the trailer grounds thru the hitch.
E1999 7.3 PS 6 Speed,TS 6 position chip. K&N CAI, 4" straightpipe, Auto Meter Elite gauges.