I have a 84 camaro and I parked it one night and the lights were fine, next morning I noticed that I didn't have any interior lights or courtesy lights and no radio, I step out and noticed that the only exterior lights I have is my turn signals, brake lights, and 4ways. I checked the fuses and they checked out fine but when I tested the courtesy lights for continuity they came up with a short, so somewhere in this circuit there is a short I think. Anybody have any ideas of other things that could cause this or any common places where these cars short out in this circuit? thanks!

 

Found out what it was, wires had rubbed through the insulation by the oil pan and burnt the whole way through. Moderator can delete this now. Thanks!