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Field Circuit Drain Test

NOTE: Connect voltmeter negative lead to alternator rear housing for all the following voltage readings.
  1. Turn ignition off. Measure voltage at terminal "F" screw head. See Figure. If voltage is less than battery voltage, go to next step. If battery voltage is indicated, system is functioning properly. Further testing is not needed.
  2. Measure voltage at terminal "I" of wiring harness connector. If voltage is zero, go to next step. If voltage is not zero, repair short to voltage in circuit "I".
  3. Measure voltage at terminal "S" of wiring harness connector (with connector connected to regulator). If voltage is not zero, go to next step. If voltage is zero, replace regulator.
  4. Unplug wiring harness connector from regulator. Measure voltage at terminal "S" of harness connector. If voltage is not zero, repair short to voltage in wiring harness. If voltage is zero, replace alternator.
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