Do you have a picture of the alternator? I bought some Isuzu factory "rebuilt" alternators on Ebay a while back, cheap. They say Factory Isuzu and "rebuilt" all over the boxes, but look brand new. They have the smaller serpentine belt pulley, one less groove than my 2000 and the round connector for the wiring harness instead of the squared off connector.

'94, and '00 Amigos and '00, 01 Rodeos. Rodeo springs and aftermarket 'hard top on 94. Aisin hubs OME 919's on the 2000 Amigo. 2000 and 2001 Rodeos have OME 912's and Aisin. Smoother ride with the OME 919's???