2004 blazer I just bought a week ago and all interior lights worked. I had an issue with my heat so I brought it back to let them fix it. So their mechanic fixes heat (flushed heater core and replaced a vacuum line) but I get it back and none of my interior lights work at all. I checked fuses with my little fuse tester and #8 (courtesy Lamps) is dead. So I pulled fuse and it looks fine so I checked for continuity with my multimeter and fuse is good. I also put a known good fuse in there and tested with my fuse tester and it said it was dead. I checked it out quickly to see if there were any shorts in the wire and I didn't find anything. Any advice?

 

there are two different fuse panels on those I believe. Have you checked both?