On my 97 deville the left tail and left marker are not working. If I put on the right turn signal and short the left tail and right turn wires together at the trailer connector then I get a blinking left tail and marker. In the middle of the hidden inboard BIG fuse panel there is a 50amp fuse which will turn off the right marker and tail light. I haven't been able to find a blown fuse anywhere. I also haven't found a schematic for the light switch either. I've pulled all the relays and haven't found one that controls the right tail and marker either.
Do I need to order a service manual for my car to get the schematics?