Would someone save me the trouble of going through an electrical schematic? I have a '90 K5, when I hit the hi beams, the hi go on and the low go off, wtf? Is there a relay or something that I've missed? I've cleaned the connecters, replaced all 4 headlights, yes I even checked the fuses. I tested the circuit and the low is gone when on hi. Any info would be greatly appreciated. Shawnboy. If you are having too much fun it's probably illegal.