Your Neighborhood Pikey
I noticed many references to the MKIV alternator being a direct swap into the 1JZ. It isn't really a direct swap since the plugs on the alternator are different. I accidentally broke my alternator playing around with it (don't ask), so I did a little research on a replacement. Oddly enough, the alternator from a 1992-1994 SC300 only, not 400, is a direct replacement for the 1JZ. It's a perfect fit, and the plugs are identical, so there's no cutting involved. Just plug and play. The best part? The SC300 alternator is a 110 amp alternator. Oh and another great part? I paid $130 with tax for it, lifetime warranty from Lexus. How about that? Funny that the Lexus part ended up being cheaper than the Toyota part. Anyhow, I thought I'd pass along my experience in finding a direct swap for the 1JZ alternator.