[tentcamper]

All my ceiling lights have a natural (white wire) and 12v wire both tied to a 12G wire, but all my running, turn, and brake lights are grounded to the aluminum skin. Everything I have seen inside the camper from the fridge, fans and water pump all seem to have a white natural wire.

I also have the white natural and bare ground wire on the neg battery terminal.

My schematics shows a natural wire to the ceiling lights ground. If I look at the newer TM schematics it shows a chassis ground on the ceiling lights. There must have been a cost saving change made some time after 2003.