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The Prestolite A0012800LC looks to be a self exciting alternator. It does not need a signal/ switch to get it to charge.
https://www.filterspro.com/PRESTOLITE-LEECE-NEVILLE-A0012800LCBRALTERNATOR-14V-160A_p_742256.html
With my truck running 13.8v on the front battery and 28v on the rear...