ok, here we go... i have an '86 chevy chevette and when i disconnected the stock radio there were 2 speaker wires, and a ground, a positive wire, and another wire... after i connected everything EXCEPT that other wire to my new HU, my dash lights stopped working... and its not a fuse, and when i was playing around i touched the mystery wire to the positive and the dash lights lit up...?? so could that wire have something to do with my dash lights not working???