My Acura has a 4-wire harness going to the alternator. I don't remember what all those wires do now, but I do recall I had to disconnect all of them to kill the alt. Have you tried unplugging all of the control/sense wires to the alt?
I bought a 4 circuit switch and used wire harness from Ebay (so I don't have to slice my original harness) for the purpose of wiring in the dash switch, but never got around to it.
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