Rectifier Diode / Bridge: Testing and Inspection

1. Check the continuity between the (+) heat sink and the stator coil lead wire connection terminal with an ohmmeter. If there is continuity in both directions, the diode is shorted, so replace the rectifier.




2. Check the continuity between the (-) heat sink and the stator coil lead wire connection terminal. If there is continuity in both directions, the diode is shorted, so replace the rectifier.




3. Connect a multimeter to both sides of each diode, and check each of the three diodes for continuity.
If there is continuity in both directions, or if there is no continuity, that particular diode is damaged and the rectifier must be replaced.