I have a 1989 xjs convertible. My driver side fog went out. The passenger was working just fine. I replaced the bulb and also the fuse. Turned them on and nothing. Passenger won't even come on. Any ideas as to what to look for, Thanks

 

Pages 13 and 14 of the attached pdf provides the wiring diagram/location data for fog lights. Start with the fuse.

 

Did you check the ground?

 

Still working on it.