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Charging System Testing

  1. Ensure 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 should be no more than 2.5 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 a minimum of .5 volt more than battery voltage.
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