1969 Barracuda Fastback
Wolfgang,
Super nice job on the interior.
Electrical gremlins can be a pain in the arse to find. I hate it and I am an electrical engineer! Many lights are turned on by fully completing the ground circuit, so if there is something bad with the wiring (like insulation broken off or pinched) then you could have that type of situation where the light never goes off.
Good luck!
Hawk