Re: 87 iroc charging nightmare
You have 3 wires leading to the alternator. One is a very heavy gauge wire all by itself that goes to the battery post on the alternator. The plug has 2 wires, one red about a 14 gauge and one brown about 18 gauge. Take a volt meter and check the volts running through the brown wire when the key is in the off position. It should be zero volts. Turn the key on to the run position and check the wire again. It should be 12 volts or whatever the volts are in the battery at the time. This brown wire runs to the negative side of your voltmeter in your instrument panel. The positive side of the volt meter goes to your run position of your ignition switch. From your ignition switch, it goes to the I/P ignition cluster. Yes check to see if you have power at this point. If you need a colored wiring diagram, I'll send you one. In a pinch as I said in my other post, I had the same problem as you, and all I did was energize the brown wire by cutting it and jumping the side going to the alternator into my primary wire that led to my distributor. When the key is off / the alternator is off thereby not draining the battery. In the run position when my distributor wire was energized, so was the alternator into charging mode. As I said, it was only a temporary fix to keep the battery charged, and when I find the time, I will go back to troubleshoot the circuit. If you find what my be causing your problem, please let me know, it could quite possibly help me solve mine.
Last edited by MwayneH; Mar 10th, 06 at 05:59 PM.