Hello FTE,
Where do I begin in tracing no voltage for cab/ courtesy lights in my '86 F150.
*started with test: 15 am fuse marked for CSTY Lamps at in cab fuse block is ok/ with power. Bulbs are ok. No lights activate with open doors or Headlight switch.
Is there a relay or another link I need to track down? And/ or online 86 specific wiring diagram somewhere?






Thanks for suggestions and commentary!

 

So, you are saying turning the headlamp switch to the left (nor opening the driver's side door) doesn't turn on the interior lights, but the fuse is apparently OK?