Charging intermittent, sometimes it does sometimes not

Bewy said

If the alt has a lot of mileage, I would suspect the brushes are worn out. Just like an electric drill that has brushes, the brushes eventually wear out.

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With a 50 year old car whose knows how many miles are on anything.... now that I swapped in a new alternator my problem should have been fixed (unless the new alternator is faulty). So I’ll have to troubleshoot per 67dart273’s instructions above. Just waiting for the weather to cooperate. We got 6 inches of snow yesterday so I’m not too keen to be troubleshooting in the cold.