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I picked up the same alternator which oddly had a different model number than the 1st one. Everything was the same except the positive cable stud on the back was bigger. The new Delco reads 27.32v and is running normal. I also bought a new 24v regulator for the 1st delco that was showing 24v...

load tested each one and they look fine.

So the last couple days i have been able to get the batteries back to 12v+ each and here are the numbers after letting the engine idle for 10 min. ENGINE RUNNING (NO HEAT) Alternator - 25.02v Batteries - 25.04v ENGINE RUNNING (HEAT ON) Alternator 24.73v Batteries - 24.80v Weird how the...

Not impossible I was sent the wrong one, but if you did put a 12v alternator on a 24v system... would it even start or work at all. I wouldn't think so, right?

Yeah it's an automatic 12/6 charger. Left Battery = 13.52v now and holding Right is at 9.2v and charging up again.

Its right near me in Baton Rouge on airline, and they give me dealer prices which is nice.

I am going to take them back to interstate where I picked them up and swap them, since they are only a couple weeks old.

Right battery after charge is at 7.62v / Left is charging still. But doesn't look promising! *The new alternator was because the old one that came on the humvee went bad. Yes, the Delco 21si is a 24v unit :)

Yeah I know what they should be at, and everything is 24v (no 12v accessories). I have them on the trickle charger now, but being brand new batteries and a new alternator. I imagine the alternator is the source of the problem? All my grounds are spotless and good connections, and i routinely...

I put in a new Delco 21si alternator in one of my 6.2 M998's and it's been running fine for 5 months. Then last night I noticed the headlights were very low, and i looked at the voltage gauge and it was all the way to the left (red). Went straight home and took a reading with my voltmeter...