A couple of questions to make finding this easier.
When I first started troubleshooting this, I disconnected fuse 8 and put my ohmmeter to the headlight, but got no continuity. I will try fuse 8 to pin 12, which I think will be oK and then pin 13 to the bulb and go from there. I would assume this would be a valid test?
Is connector C148 inside the instrument panel near the passenger end, near the center or inside the engine compartment? It also looks like it should have a handle/hinge mount on it, would that be accurate?
It also appears that connector 148 feeds connector 266 or 268 that feeds the fog light switch itself.
Daylight running lights are shown on the diagram. I have to plead ignorance that I don't even know if this vehicle has them. If it does could this be involved with the problem and how would I know if I have them?
Auxiliary relay box #2 is shown on the drawing. Is that the one between the air filter and the front grill? If it is there are three relays in mine. A large one that seems to always energize when I take it out and then plug it in and two smaller black ones. I would suspect one of those to be the fog light relay but there are no markings on the box or my manual indicating what's what. Which one is the fog relay and what do the other two do?
Thanks I think I'm almost done.