Why Would Trailer Turn Signals Stop Working When Headlights are On
Question:
2001 Jayco 237 RV. The right rear light works if flasher is on. Turn light works. Neither of these functions continues if you turn on the truck lights. All other lights function normal. Whats up.
asked by: R. N
Expert Reply:
Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface.
What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem.
