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Its a Leece Neville / Prestolite 4827JB. It is what the HET and HEMTT use. Some photos of the finished product here - http://www.steelsoldiers.com/showthread.php?81412-Photos-of-My-M916&p=1800132&viewfull=1#post1800132
Also attached a crude diagram of how the whole system is set up.
I think the other 12v thing on the M939 is part of the ABS system and is hooked up the same way.
I just finished converting my M916 to a 24v alternator. The stock OEM arrangement is an 85 amp 12v alternator with a 15A 24v transformer rectifier hooked to the back of it. The starter and trailer...