Question: Can anyone tell me why my rear marker lights and my right rear tail light goes off and on like a bad circuit breaker? If it has marker light breakers, where are they located?
Answer: Our best guess is that you have a loose bulb or loose connection to the right rear tail light. Since the lights do come on and off then the problem is not related to a faulty fuse. It is related to a faulty or bad connection either on the positive or ground leads.
You will need to trace the wiring and look for a loose or corroded connection. The good news is that since it involves both the marker and right rear tail lights the problem is wherever the two circuits meet.
If you have any wiring schematics it would be of great help in diagnosing this problem. If not, look at the wiring of your truck since it provides power to the marker lights of the slide in camper.