I understand this has been addressed over and again on this forum, but there are no answers past the basic dimmer or headlight switch replacement. Has anyone with this issue fixed this issue? 1994 Chevy C1500. It has head/parking/tail lights functional. When the headlight switch is switched on, it there are no dash lights and the HVAC lights go out. I have tested the wires going to both switches and they have power. I have tested & replaced the switches and they have not remedied the problem. The bulbs in the dash have been check/tested and are good. I have not had the opportunity to trace wires yet. I would think someone on here has likely come across this and found the answer. Perhaps a specific ground?