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I would check all the main grounds. Such as the grounds off the batteries to the frame and the frame to the block. The fact that you had an intermitant reading says that either it's a broken wire or a loose or dirty wire (or some contact that isn't quite making). You may have to get someone...

Time for a frosty malt beverage. Hope it is the diode.

Kind of like how you can jump a 12v car off a 24v Blazer if you connect to only 1 battery. Ie the positive and negative of the same battery.

Great Glad you got it running!!!!:-D

May be time to try to hit up some of the AZ guys to see if someone could come by and you could look at their truck as an example. I have fixed many problems by having a good running example right next to me. With someone doing "home made a/c work" to your truck there may be wiring issues that...

Thanks mistaken1 I did not know that. I assumed as I had seen many with a plain alt on 1 and a isolated ground on 2 that's the way they were.

You know that the alternators on the cucv are not the same type right? One has an isolated ground, The other doesn't as they are both 12v alternators. Are all of your gen lights on? a blown bulb can disable the exciter wire( I think)