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Ah, if the regulator is all one piece with the alternator then the PCM is doubtfully an issue, since the regulator is a sefl contained unit.
You got a pic of the wiring diagram? For some reason the site I use at home here froze whenever I tried it.
But yes, sounds like the circuit feeding voltage to the alt is the issue. Check the fuse, check all the connectors it goes through, etc to find where you have an open or whatever.
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