This might be a dumb question, but have you probed it with a voltmeter at all? Just to verify that the alternator is in fact charging, and that the the alternator voltage is seen at the battery when it is running? The only other thing I could recommend, is visually trace the feeder wire from the alt to the battery, checking bends and connectors carefully. Although it sounds like you've already done that. Mine died on me once because the wire was corroded and broke near that spade connector on the battery side, an easy fix but it took me awhile to figure out what had happened. I never got a charging light on mine though.