Diode Test

Remove rectifier assembly from alternator. Set ohmmeter knob at 10. Calibrate meter. To test one set of diodes, contact one probe to terminal bolt and contact each of three stator lead terminals with other probe. Reverse probes and repeat test. All diodes should show readings of about 60 ohms in one direction, and infinite readings with probes reversed. Repeat test for other set of diodes, moving first probe to other terminal screw. If meter readings are not as specified, replace rectifier assembly.