I should have taken my own advice and checked the "simple" things first. The ground post on the alternator and the ring connectors were corroded (rust). I cleaned them and re-installed the alternator and guess what - IT WORKED LIKE IS IS SUPPOSED TO!
I still don't know what brand or amperage the alternator is but at least it works!
I still don't know what brand or amperage the alternator is but at least it works!