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Ok, so I got some time and started to look at the old alternator again. I picked up a cheap (<70 dollar) regulator and popped it on. I am back in business. I had a bad zener diode and regulator. The other good news is I have a ready to go kit to drop in a Delco 21si J180 style mount alternator...

120, they are taking care of me and will test it, it has a 1 year warranty.

well bad news. it went in fine, got the belts, etc. It had no ouput, looks like I got a bad unit. To double-check my wiring I did the following. Measure battery voltage @ Pin C of electronic control box = checked good 25.8 volts Measure resistance from Pin D of electronic control box connector...

Well the Delco 21si type alternator doesn't really go in as easily as one would think, at least if you read the forums on a M923 w/NHC-250. I am almost done but not quite. I bought the parts you see above. So far I needed to fab up the following: 3/8" spacer from 3/8" pipe for FWD lower bracket...

Well I found a bad zener diode that is connected to one of the brushes and the voltage regulator on one side of it. I replaced it and no luck, still no output. I thought I nailed it but I could still have a bad voltage rectifier. I am probably going to go civilian... :(

Looks like I might have found a bad component and would make sense as to why the alternator has no output. I will let you guys know if it works after replacement.

I was looking for pictures of an install on a NHC-250 and didn't come across any. The alternator is 180 clocked from those pictures for an NHC-250 and wasn't sure what mods had to be made to make it fit.

Hey, I did my homework and am really looking for suggestions on what path to take from people who have had similar/same issue. Volt meter shows in top of yellow range Batteries individually measure 12.6+ Battery voltage across the whole bank = 25.6 I hear the safety relay disengage when...