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Voltmeter Test Procedures

NOTE: When performing charging system test with a voltmeter, turn off all lights and electrical components. Be sure battery specific gravity is at least 1.230.
  1. Connect negative lead of voltmeter to negative battery post and positive lead to positive battery post. Record battery voltage.
  2. Attach tachometer and start engine. Operate at 1500 RPM with no electrical load. Voltmeter reading should increase 1-2 volts above battery voltage. Reading should be taken when voltmeter needle stops moving.
  3. With engine operating, turn on 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 0.5 volt increase over battery voltage. If system conforms to these readings, operation is normal.
    Fig 1: Rear View Showing Alternator Terminal Location on Rear Terminal Models Do not ground field circuit between alternator and regulator.
    G09337418Courtesy of FORD MOTOR CO.
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