the harness is slightly different and you end up getting a CS model alternator instead of what you already have (a SI) model, so the harness is slightly different (lots of alternator shops sell adapter harnesses), but a '94 Chevy Caprice alternator bolts right on and is 140 amp, if you have the correct harness. That said some people have been posting part numbers for a 22si 150 amp alternator for about the same price from some of the big rig dealers and I think that is the ticket if you ask me, and reuses the same harness from the bread truck... And is rebuildable etc etc.,..