I've been trying to work through this rats nest of wiring to figure out how to get my instrument light to work. Played with dimmer while checking voltages, checked 3A fuse, then measured voltage across fusebox for the acc light fuse... 0 with lights on. Interesting. Based on wiring diagram, I believe there is an instrument lamp wire that comes off the headlight switch that should go the fusebox before going back to lights in dash. Of note, they have flickered on and off before, so I could also potentially have a bad ground, and there are plenty of ground wires hanging from back there that are abandoned. But with the zero volts across the fuse block for panel lights, it could be no supply OR no ground.... right?