'64 buffalo,
This is a weird one. Your rig has a alternator, not a generator...right. If it has a alternator, the DA plug with the two wires on the little connector are sticking out of the back of the case..pointing toward the firewall, correct.
This problem sounds like a bad voltage regulator, but the ammeter activity makes it appear you have a generator instead of a alternator.
It's possible for the battery to discharge through the alternator, and through a generator too. There is a cutout relay in the voltage regulator that suppose to open when the rig is shutdown to prevent this.
The ammeter pegged to full charge for 30 miles must have been a sight to see. Activity like this could conceivably blow a battery up. Be sure to check the battery water as it might be all boiled away. Keep searching.
Stuart
