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Load Testing

  1. Attach tachometer to engine. Start engine. Load alternator by switching heater/air conditioner blower motor to high position and headlights to high beam. Increase engine speed to 2000 RPM.
  2. Voltmeter should indicate at least .5 volt more than base battery voltage. If voltage reading is within specification, alternator operation is normal. If voltmeter reading indicates high voltage (3 volts greater than base voltage), proceed to HIGH VOLTAGE TEST. If voltmeter does not indicate .5 volt or more greater than base voltage, proceed to LOW VOLTAGE ON-VEHICLE TESTING.
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