To add, that is the old school 100 amp alternator made by Leece Neville. The new style 100 amp alternator is made by C. E. Niehoff. The older type is reliable. The HMMWV came with the 60 amp alternator, which is shared with the 5 ton. Shelter carrier and ambulance HMMWVs came with the 100 amp alt in the picture originally.