I'm starting to think its an epidemic..

It would help to take a few voltage measurements. I assume you have the old style alternator with only a field and a battery wire. The battery wire should be the same voltage as the battery as it is connected directly the positive side and should be at least 12 Volts DC when the engine is not running. The field connection comes from the regulator and can be checked with an ohmmeter for continuity to see if it gets all the way back to the regulator. If you temporarily energize the field with a jumper to 12v you should get max voltage out of the alternator while it is running. If that works then your problem is back toward the regulator. If not your alternator is bad.

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