Field Circuit Drain Test

Connect the voltmeter negative lead to the Generator (GEN) rear housing for all of the following voltage readings:






1. With ignition switch turned to OFF position, contact voltmeter positive lead to Voltage Regulator (VR) F terminal screw. The meter should indicate battery voltage if system is operating normally. If less than battery voltage is indicated, proceed with Step 2 to find cause of current drain.






2. Measure voltage at I terminal (ignition switch OFF). If voltage is indicated, service I circuit from ignition switch to eliminate voltage source.
3. If no voltage was indicated in Step 2, contact voltmeter positive lead to wiring plug S terminal. No voltage should be indicated. If no voltage is indicated, replace the voltage regulator.
4. If voltage was indicated in Step 3, disconnect the one pin S terminal connector. Again, contact voltmeter positive (+) lead to voltage regulator wiring plug S terminal. If voltage is indicated, service S lead wiring to eliminate voltage source. if no short is found, replace generator assembly.

Alternate Test Method
Use Rotunda Power Sensor Plus Electronic Battery Test 162-00002. Follow the manufacturer's defined test procedure.