Sounds like your are having Igntion run-on problems. Make sure your power wire that runs to the Alt. to the Ignition switch feeds through an Idiot-light. This could also be corrected as suggested by using a diode, But is not recommended as the diode creates an in line volt drop of .7 volts. In other words the 12 volts at the igntion switch becomes 11.3 at the regulator. It appears to the Alt. that the battery is low and it causes the Alt. to over-charge. Maybe this will help--Paul
