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Charging System Testing

NOTE: Ensure that battery is fully charged and battery connections are clean and secure. Check that alternator drive belt is adjusted to proper tension.
  1. Ensure that all accessories are turned off. Connect voltmeter to battery. Attach tachometer and start engine. Operate at 1500 RPM with no electrical load. Voltmeter reading should increase, but it should not exceed 2 volts more than battery voltage. Reading should be taken when voltmeter stabilizes.
  2. With engine operating, turn heater or A/C blower motor to HIGH position. Turn on headlights to high beam. Increase engine speed to 2000 RPM. Voltmeter should indicate at least .5 volt above battery voltage.
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