Regulator Output

Make certain alternator belt is correctly tensioner and that all charging circuit connections are clean and tight. Connect voltmeter to battery, turn off all electrical loads and note battery voltage. Run engine at 1800-2000 RPM for 2-3 minutes and note voltage reading. If voltage reading is 1-2 volts higher than battery voltage, regulator is OK. If voltage reading not within this range replace regulator. If reading is OK, turn on headlights and blower motor to high speed. Voltage should not decrease more than 1/2 volt. Replace regulator if voltage drop exceeds 1/2 volt.