Intermittent Trailer Brakes and Marker Lights

wnjj wrote:
I didn't see this thread until the OP already got it fixed but to those suggesting "ground", how can you explain functioning brake lights?

Granted, bad grounds are often the cause of issues, especially mysterious ones but this was clearly not one of those from the original description.

Thanks for reporting back, OP!

Because "Checking the Ground" is ALWAYS what people with lack of knowledge state to do. As a professional RV Tech. GROUND's causing problems are extremely rare. Besides, on a trailer, even with the grease on a 5th plate or Tow BALL, that is enough to complete a ground to operate the Trailer lights. Doug