I've got a 1967 Cutlass Supreme that I have been slowly replacing the dash lights in. While driving around the other evening al;l the dash lights went out at once. I assumed I had blown the fuse. However, upon inspection the Fuse is fine. I've replaced the fuse just in case but still no dash lights. What else might cause all the dash lights to go out at once?

Thanks!

P.S. The turn indicator lights still work.

 

Try the dimmer on the headlight switch, turn it back and forth to see if anything happens. Then check the big plug on the dash circuit board from behind to make sure its tight...

 

Well, there is definitely something wrong with the headlight switch. Headlights still work but when I changed the dimmer position my courtesy lights all went out. I love old cars!