Regulator and Diode Test
- Disconnect regulator field lead (EX). Attach jumper wire from field terminal (EX) to output terminal (B+). See Fig 1. Turn ignition "ON", and run engine at fast idle speed.
Attach jumper wire to field and output terminals .
- Connect negative lead of voltmeter to ground and positive lead to output terminal (B+).
- If voltage rises to 14-16 volts in this test, but did not reach 14 volts in Output Voltage Test, regulator is defective.
- If output voltage does not rise, and field current has been proven satisfactory in Field Circuit Test and Additional Field Circuit Test, either alternator stator or the rectifier diodes are defective.