Trailer Lights Go Out when Brakes are Applied

Expert Reply:

You may have a ground issue. Make sure the ground on the trailer and the Durango are securely attached to a clean surface. If this is not the problem you should check the trailer for proper wiring. If you did not use a wiring harness with a converter box in between the truck and the trailer connection then the break lights will not work because the Durango is on a five wire system and the converter sends the break light signal from the red wire on the vehicle side of the converter to the yellow and green wires that carry the signal for both the turn signals and brake lights on the trailer. I have provided a link below for the T-One custom fit harness for your vehicle which would install in line with your vehicles taillights and includes the needed converter box. You can also hard wire a harness with our 4 pole hard wire kit with converter (see link below) if you would like. If this doesn't help let me know and we will work through the problem. 118334, 20251

expert reply by: Bob G