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Field Voltmeter Test

  1. Turn ignition switch OFF. Remove wire from regulator supply terminal.
  2. Connect tester and make knob adjustments as shown in illustration.
  3. Voltmeter reading should be 12 volts. If there is no voltage reading, the field circuit is open or grounded.
  4. If voltmeter reading is more than one volt but less than battery voltage, there is an indicated partial ground in alternator field circuit.
Alternator Amps. Field Current Voltage
55 2.8-3.3 12.0
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