Hello all I have a 92 Blazer I purchased from craigslist for $800, runs like a champ but im having some electrical issues that are above my expertise... When i got it all the lights appeared to work, the dash lights were very dim, i suspected maybe more then one bulb in the dash was gone, I had a subwoofer installed, did the head unit myself... but recently noticed the parking lights dont work and now neither do the dash lights, brake lights and headlights still work fine, when i replace the fuse in the "tail lps" spot in the fuse block it blows as soon as i hit the switch... need input

 

sounds like you grounded the wire fore the dash light dimmer or the switch is bad the dial next to the head light switch does go bad and may cause this or when you put the head unit in you grounded the dimmer wire i think it is gray but am not sure start there that switch controls those lights or one or the parking light wires is grounding out some ware