63 Riviera with new V regulator. Amp light came on dimly after driving for about 15 minutes and stayed on for a minute or two, then went off as I pulled into the driveway. Charging voltage is about 14.3V at idle. When I connected the charger, the battery was fully charged. Battery is less than 2 years old and was over 13 volts with car off. Alternator belt tension seems fine. Any advice what else to check? Thank you.
Matt