Trailer Brake and Tail Lights Go Out when Headlights on 2000 Chevy Silverado Come On

Question:

I have 2000 silverado and 68 rv with 4 pole converted to 7pple for trailer brakes. All lights work until headlights come on, then rv brakeandtail go out when I press brake. Still have power to them just not enough to keep them on

asked by: Brian

Helpful Expert Reply:

This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light.

Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces.

The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.

expert reply by: Michael H