Assuming this is a 10SI Delco alternator, with the engine off, battery connected, ignition on, using a test light, on back of the alternator, should have full battery power to the big red terminal and the #2 plug connection, and a dim light on the #1 plug terminal.
Sounds like maybe you've lost connection from the output terminal (big red) to the battery. Loss of connection to any terminal will cause the battery not to charge.
Also be sure the belt is tight and in good condition. Should not be able to turn the alt fan by hand.
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