Replaced the alternator with a rebuilt from Advanced Auto because they had a great sale going on :kooky:
So far all is well.
I took it on a trip today and tried to aggravate it by accelerating a lot and never got a battery light so it looks like it's fixed. I see tons of messages on the net about people with this or similar problems. Battery light intermittent, may come on for an hour maybe not for 10 seconds. Voltage is always 14.0 or higher and car runs and starts fine.
They all seem to end the same way though, with the car dead on the side of the road.
Seems it may run for months like this or days so I didn't want to take a chance.
Bottom line, if all looks well, connections, battery, grounds, belt and so forth an intermittent battery light with good voltage might just be the alternator.
Thanks to everyone for the help!
P.S. The car seems to have more get up and go than it did with the original alternator. Probably the placebo effect but I'm happy!