I was looking at the wiring diagram for my early model M20J (24-00048).  Need a replacement nav light bulb.  What was weird was that in tracing the wiring, there are four wires on the nav light switch.  Three nav lights (l, r, & rear) and the gear unsafe light.  I'm not an electrical whiz but how is it possible that the gear lights are wired through the nav light switch?  I typically leave them off during the day but the gear lights seem to work anyway. Mark