Rectifier Diode / Bridge: Testing and Inspection

Positive Rectifier Test:

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.

Negative Rectifier Test:

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.

Diode Trio Test:

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