Hi there. recommissioning a 1980 Spitfire 1500, lots of electrical work. The car was rebuilt early 90's, but some things not done too well. The rear fogs don't work. I've fixed the foglight switch - it now lights up on pull with headlights on, sidelights OK but the fogs don't come on. Taken the Wipac lamps apart and cleaned and set all contacts, checked bulbs ok. Its a bit odd wiring where the positive live goes through the reflector to the sleeve of the bulb, and earth goes to the pip via a tongue on the mounting bolt. Is there maybe a separate line fuse somewhere else?
