My car's interior lights/tail lights aren't coming on!

[Black88GTA]

Relay somewhere in the loop that's cutting out? Circuit breaker?

I don't know about your car...but mine has a couple circuit breakers in the fuse box. They look like metal oversize fuses...have the 2 flat prongs like the other fuses, but they are much larger This could explain why it works sometimes...breakers will reset themselves when tripped. Maybe one of these is going bad? Or is overloaded, causing it to trip?

Good luck!

 

[Wag]

Could be more than a fuse.

I have a '95 Olds Achiva and had similar problems, then I lost my freakin' headlights while driving! It was some relay switch. Cost over $250 to fix. GM POS.