the switch under the handbrake. i take it you have took the bulb out of the instrument panel and put it in another socket then checked it?? if so, more than likely under that handbrake
mine also wasn't working untill i noticed when i was wiring in my stero that the wire connecting to the handbreak had been cut so just reconnected it, might be lucky and it be that simple.
mine also wasn't working untill i noticed when i was wiring in my stero that the wire connecting to the handbreak had been cut so just reconnected it, might be lucky and it be that simple.