High level stop light (roof level) not working. Is this an MOT failure?
Car is a SAAB 9000. Compared to modern cars, it looks like the high level stop light was put on as an afterthougt by the designers, as it is quite exposed. Disagnostics suggests a wiring failure rather than bulb problem. Wiring jumps from top of the hinged tailgate to between the roof and the roof lining, so it's quite complicated to trace.