Right Side Trailer Brake and Turn Signal are Not Working but All Other Lights Work

Question:

MY TRAILER LIGHT ON THE RIGHT SIDE. THE STOP AND TURN SIGNAL QUITE WORKING. THE RUNNING LIGHT WORKS. THE LEFT STDE EVERYTHING WORKS.

asked by: LARRY

Expert Reply:

This is a classic ground problem, especially since everything else is working. It could be at the trailer connector, vehicle or trailer side, or at the light itself. Start with the vehicle side connector and make sure it is properly grounded and that any corrosion or dirt is cleaned out of the connector. Then do the same with the trailer side connector and the main ground for the trailer.

Some lights ground through a wire and others ground through the mounting studs. In both cases the grounds need to be attached to a clean and corrosion free bare metal surface.

expert reply by: Michael H