Field Circuit Drain With Internal Regulator

NOTE: Connect the voltmeter negative lead to the alternator rear housing for all of the following voltage readings.

Voltmeter Leads:

1. With the ignition switch turned off, contact the voltmeter positive lead to the regulator F terminal screw. The meter should indicate battery voltage if the system is operating normally. If less than battery voltage is indicated, proceed to Step 2 to find the cause of the current drain.
2. Disconnect the wiring plug from the regulator and contact the voltmeter positive lead to the wiring plug I terminal. No voltage should be indicated. If voltage is indicated, service the I lead from the ignition switch to identify and eliminate the voltage source.
3. If no voltage was indicated in Step 2, contact the voltmeter positive lead to the wiring plug S terminal. No voltage should be indicated. If no voltage is indicated, replace the regulator.
4. If voltage was indicated in Step 3, disconnect the wiring plug from the alternator rectifier connector. Again, contact the voltmeter positive lead to the regulator wiring plug S terminal. If voltage is indicated, service the S lead to the alternator plug to eliminate the voltage source. If no voltage is indicated, replace the alternator rectifier assembly.