1985 GMC S15 High Sierra 2WD 2.8L
Discussion Starter · #1 ·
Hey guys! New to the S10/S15 scene. I recently purchased an 85 S15 Truck. The first thing I wanted to do was get a new head unit because the original didn’t work very well. The original connectors only had wires for a switched +12v power source, illumination, and ground. I used the constant +12v from the cigarette lighter since I won’t be using it ever. Well now it’s hooked up and it works but ONLY when the dimmer is all the way to the left. If I move it to the right, the radio turns off as well as all my dash gauges. My dash lights also no longer work. Not sure what’s going on... any help would be appreciated. It’s hard to find installation write ups for these years of trucks.