Alright yall. Here’s the problem. Buddy of mine has a 2000 GMC 1500 with the 4.3 L V6 (I think, I know it’s a V6) pickup. Whenever he puts the key in the on position, but doesn’t start it, everything is working fine. Gauges, lights, radio, AC, everything. As soon as he turns the key to start, the fuse marked “IGN C” (ignition C) blows. The truck doesn’t even try to crank. The fuse instantly blows. You can hear the fuel pump running just fine. When the fuse blows, everything except the gauge cluster works. We’ve checked all the wires going from the starter to the battery and alternator. Don’t know if this helps, but last night while working on it, we shorted the courtesy lamp fuse out. That fuse is located directly below the IGN C fuse. We took apart his fuse block to see if maybe we screwed something up internally and that was causing it to short. Everything is fine. We called Napa and O’reiley’s and they both said it has to be somewhere in the fuel injector wiring or the crank wiring that is shorting. I’ve looked at the fuel injector set up and it is one single nozzle mounted vertically in the intake manifold. We don’t know what to do. We’ve checked everything. His battery terminal was very corroded a while ago, but we replaced that with a new terminal and battery and sprayed anti corrosion stuff on there. The positive wire however is very stiff going into the auxiliary battery cable hook up (yall that know Chevy’s, I’m talking about the little red box connected to the power wire on the battery). Please help us. We are out of options. Thanks yall.
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It must be the solenoid if you were able to get it to crank by jumping the starter directly to the batt.