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I've never heard of a FJ40/55 alternator not being able to run the AC. I would get a FJ60 style internal regulator style and run the charge directly to the battery. You will need an aftermarket amp gauge but I run this style on my 40 and 60 (of course) and it has an AC.
Keep reading. Your old 55 regulator may not be up to task.
Keep reading. Your old 55 regulator may not be up to task.