I noticed last night as our coach idled with the lights on that the rear running lights and the lights that eliminate the rear license plate would flicker off and on occasionally. Any suggestions where start tracking this one down?
Flick, verify that those are the only lights flickering first. That will eliminate several possibilities if the front parking lights are not flickering. If it is limited to the rear, check for a bad ground or a connector that is loose at one of the lights or in the electrical panel in the rear.
Agreed check the Ground Wires.
It's almost always a bad ground.