It was the alternator. Again. Looks like the rebuilt was not very well rebuilt. What tipped me off was when the alternator light stopped lighting when the key was in 'run' position with the engine off. After driving, the light came back on, then off, etc, but voltage at the D+ terminal stayed +12vdc.

So off the auto parts store for a replacement alternator, some sandlot mechanic maneuvers in the parking lot to install it, and all is well.

There is a lesson here somewhere.

Thank you for your suggestions. They kept me from resorting to hammer time.