two possiblies
ground is overloaded with all lights on, or
some nimrod , has a TRAILER light , trash job going on there.
look for wire nuts and splices in harness going in or out or a 3 to 7 wire conversion box, scabbed in .
ground problem kills tail and stop.
the problem is on that Green/white wire, well if driver is on the left,
PR?
I looked at a96 schem , and its same wires, same colors.
the black wire is ground and goes to the body, and is shared with side lamps.
the circuits simple, if some thrashed it, all bets off.
