So I charged the battery up enough as to avoid the fault. Drove to Auto Zone to have the batt and alternator tested, guess what? Both passed. Drove it home, seems fine. Parked it, started it a few times and it seems to be cranking over well. Guess I'll let it sit for a while and see what happens. Any ideas?

 

For the 137th time....CLEAN AND CHECK ALL OF YOUR CONNECTIONS

 

sorry, left that detail off....while the batt was charging I cleaned all cables, which were still clean from installing the new battery a few months back. Checked grounds, etc. All looks ok.