With headlights OFF, all the turn signals work. With headlights ON, passenger side rear doesn't work. The running light is on but the signal doesn't work. Any suggestions.
Do the brake lights work? I have found many problems with the rear brake/turn lights in the turn signal switch. It is behind the steering wheel and the contacts wear out.
I had some new defective parking lights from MU that were wired wrong. Eventually burnt up the turn signal switch. Might try unplugging the front parking lights and see if the problem stops.
Once I rewired the lights - all was well. The color of the wires used is not correct.