Originally Posted by rick s
Is there a voltage regulator in the alternator? Or elsewhere? No access to a manual at this moment. Need to fix it today if at all possible.
The regulator is NOT in the alternator, it is part of the ECM and not replaceable without replacing the ECM. The best thing to do is get it running and take a volt meter and see how much voltage is at the coil. The coil is controlled by the ECM. One thing that you might try is to install a ballast resistor in the positive wire going to the coil. Ballast resistor from a 70s something Chevy or Ford may work, kinds a shot in the dark but that's where I'd start.