However more likely is that the sense wire to the regulator has a bad connection or cracked or something and isn't telling the regulator to "turn on".
The springy plastic clip part of the two wire connector at the alternator is weak/bad on my RV. It tends to wiggle out from engine vibration, causing the alternator to shut off. I was able to put a small zip tie around the plastic connector to hold it firmly into the alternator.
The connector isn't too expensive though:
https://www.ebay.com/itm/ALTERNATOR...RD-LINCOLN-MERCURY-1G-LARGE-CASE/181705691905
The zip tie thing has worked nicely since I couldn't sit around waiting for a connector when the problem popped up. It has held up even after pulling the alternator and putting it back for replacing the fan clutch. I should probably order one to keep on hand, but in a emergency, crimp on insulated blade connectors would work, so long as I don't mix up which wire is which. The zip tie is working for now so I see no reason to fix what's working. A big piece of gorilla tape would hold the connector down too, in a pinch.