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PROBLEM SOLVED!
Well, I charged up my 15-month-old CarQuest 'premium' 12V battery so it read 12.6V on my voltmeter. I reinstalled the alternator and battery. I had 12.6V at the alternator. I started the engine and bingo! The ampmeter needed moved to the positive side and the battery voltage increased when I revved the engine, just like it's supposed to.
The only thing I can think of that caused this entire issue to occur must be that my battery's charge was low after sitting idle for several weeks. There was plenty of cranking power to start the engine, but its low voltage apparently caused the alternator to discharge the battery rather than charge it. There may be another answer, but that's the only one I can think of.
Anyway, all's well that ends well.
Thanks again to all who provided me with your wise counsel.
Happy Motoring!
Texas Tom