if the regulator was a points style, it turns on and off, this could burn out the ECU. Mopar made a regulator for the early style that was electronic.
I had the same misfortune in a previous vehicle. where in Chicago/metro area are you? if during garage cleaning this week I come across a regulator and ECU, you are welcome to try them...just don't hold your breath, unless you want to help with cleaning?:lol: