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Great! I didn't think they would be interchangeable. I hope that the new regulator fixes your problem.

If they have the same part number on them, then maybe they're interchangeable. I don't have any experience with the dual-voltage alternators.

I highly doubt it.

Circuit 2 would be the alternator output that charges the batteries. So, if disconnecting that lead at the regulator eliminates the current drain, then it sounds to me like the regulator is bad. I don't know if they're repairable and/or easily found as a replacement part. None of my trucks have...

That sure sounds like your draw. Was that amps or milliamps? Is there a tag on the wire with a circuit number? If you can tell me the number, I'll look it up on the schematic so I can understand exactly what you disconnected.

Hey, see if this makes any sense: Ammeter usage : BASIC CONCEPTS AND TEST EQUIPMENT

LOL! I only know how to answer the first question: A multimeter can usually measure current, by disconnecting the circuit and connecting the meter in series. If you don't know what you're doing, you may blow the fuse in your meter... assuming it's not already blown. ;) Fluke ( a high-end meter...

If it were my truck, I'd use a current meter to see if the alternator is drawing current when the truck's off. Then if I saw a drain, I'd pull it out and start checking components inside the regulator. But then, I'm an electrical engineer and have fancy tools, and explaining how to do it isn't...

Excellent! You've narrowed down the problem to one of the 12V loads. The M1113-specific manuals appear to be restricted on LOGSA, but I think you'll find info on 4L80E-equipped HMMWVs in the regular M998 manuals. If all else fails, it'll be a matter of physically tracing where the 12V power...

Those wires with the yellow heat shrink appear to be connected to the 12V point between the batteries. Do you have the 4-speed 4L80E transmission? I don't have personal experience with them, but I seem to recall that their controller runs from the 12V tap in the HMMWVs. My HMMWV has the...