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Send a PM to We-Cruz, he is parting out a 1982 BJ42 with a 24v alternator. I'm surprised you can't rebuild yours. Does it have the vacuum pump on the back (I assume you have a 2H motor?)
The 12H-T has two choices in alternators...the bigger body fits without an AC compressor in place, but the smaller body fits when there's an AC compressor installed. Found this out during my swap. I have the small body one, and Sheldon can probably correct me if I'm wrong, I thought that the front housing and pulley were the only parts specific to the engine...I could have used the internals and back housing from a BJ. Sheldon was the one that researched this...so I'm a bit foggy on it.
The route I went was to have a local rebuilder rebuild my alternator and make it high output compared to the 30-40A that the OEM diesel alternators put out.
There are also internal and external regulator versions...
~John