Quirky camper lights
In the past 4 months I've had the same problem on two separate occasions with the lights on the rear of my Outfitter slide-in camper. Without going into all the details, let's say that I've checked...
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Even though you say you have checked the bulbs, recheck them again including the trucks- recheck all bulbs that have a brake light circuit and element.
The fact that more light come on when the brake is pressed is a clue. Somewhere the circuits are getting crossed and getting power by the brake circuit. There may be the chance that inside a dual element bulb that one of the elements broke loose and crossed over to the adjacent internal circuit. I am not saying this is the cause of this specific problem, but I ran into just this years ago when working at a dealership and it drove me nuts trying to figure it out.
Before going deeper, use the KISS principle and recheck all bulb that have a brake light activated. I am a firm believer in the KISS theory... in keeping with it, make sure that all grounding has good connection including between truck and camper.
The fact that more light come on when the brake is pressed is a clue. Somewhere the circuits are getting crossed and getting power by the brake circuit. There may be the chance that inside a dual element bulb that one of the elements broke loose and crossed over to the adjacent internal circuit. I am not saying this is the cause of this specific problem, but I ran into just this years ago when working at a dealership and it drove me nuts trying to figure it out.
Before going deeper, use the KISS principle and recheck all bulb that have a brake light activated. I am a firm believer in the KISS theory... in keeping with it, make sure that all grounding has good connection including between truck and camper.
