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Charging System Testing

NOTE: Ensure that battery is fully charged and battery connections are clean and secure. On non-maintenance free batteries specific gravity must be at least 1.200 prior to testing. Check that alternator drive belt is adjusted to proper tension.
  1. Ensure that all accessories are turned off. Use voltmeter to measure battery voltage. Attach tachometer and start engine. Operate at 1500 RPM with no electrical load. Voltmeter reading should increase but no more than 2 volts above battery voltage. Reading should be taken when voltmeter needle 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 above battery voltage.
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