Thanks WayneJ. So are you suggesting that the initial reading is proof that the alternator/regulator was/is working again? And that something else is likely draining the battery? I re-charged the battery, took it to an alternator store which showed the volts back down below 12. (The new battery was ...

This reading off the battery was about 11 or 12 volts. Even though that's not an excess reading, I decide to change the regulator, external to internal. The reading of volts, when running, jumps to 15! Hurry! That's good, no? No, or I'm not sure, because the battery gets drained again. Any idea why ...