Not sure I understand. Perhaps you might expand a bit on the actual wiring and electrical path it might help as any to reduce the wiring would be great. My truck never had door plungers and I would like to add them. The dome light gets power from a constant voltage source that feeds to one side of the dome light switch and assembly that is located at the rear wall of the cab near the top. That switch, when flipped supplies power to the light and the light socket supplies ground via the cab and chassis. if I install ground only door plungers there is no power path from the hot side of the cab dome light to the ground switches in the doors. That is the problem that I see. Maybe if I isolated the cab dome light so that it could not ground via the actual body of the light assembly then what you describe would work. Does your dome light assembly have a switch with the hot wire connected to one side of the switch?
Pat
