I'm trying to change my fog lights so work independently of the headlights, but still work with the fog light switch and still shut off with the ignition. In other words, I want to use them as DRLs.
http://forums.pelicanparts.com/porsche-911-technical-forum/854989-led-brake-lights-43.html#post10491918
I followed the instructions here and it's consistent with my read of the wiring diagram. However, that didn't do the job. What it did was cause my headlights to come on with the ignition regardless of switch position.
I then tried pulling each lead off the headlight switch other than the hot from the ignition switch. None of them interrupted power to the fog lights. At that point, I went forward to the fuse box. Fuse #21, fog lamps, did interrupt power to them. Fuse #20, fog light switch, did nothing and in fact has no wire at all on the bottom clamp.
What I didn't do was pull out the foglight switch, mostly because I need to remove the head unit and lacked the ambition for that.
The car is an 86 Carrera made in Sept of 85. I'm also seeing signs of other wiring that's non OE.