2008 BMW 535I electrical system problems

While driving about 35 MPH on a busy street at rush hour I prepared to make a right turn by indicating. The fast turn single flashing started and the computer system in my 2008 535I said rear turn single malfunction. I slowed to my the turn and the person behind me slammed on their brakes and swerved to avoid hitting me and almost crashed into the person next them. I didn't realize why this happened, so I pulled over to check my lighting system and realized that the right rear lights weren't functioning properly.

I ordered new light bulbs to change out my halo angel bulb lights (running parking lamps) .which said they were out on my screen inside of the BMW . When I twisted off the housing cap in the back ,the wiring inside of my headlight housing which turns on my parking lights left and right is totally degraded and flaked off ,the copper cables were touching everywhere .I read this is because germany use biodegradable material but this is a very dangerous fire hazard for driving on the highways and road in florida .