Component Testing: Rectifier

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Check the continuity between the positive rectifier and the stator coil lead connection terminal with a tester. If there is continuity between the terminals, the diode is shorted, so replace the rectifier. See Fig 1 .
Check the continuity between the negative rectifier and the stator coil lead connection terminal with a tester. If there is continuity between the terminals, the diode is grounded, so replace the rectifier. See Fig 2 .
Check the continuity of the 3 diodes by connecting an ohmmeter to both ends of each diode. If there is continuity between the directions, or if there is no continuity, the diode is damaged, so replace the rectifier. See Fig 3 .

Fig 1: Checking Continuity Between Positive Rectifier & Stator Coil

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Checking Continuity Between Negative Rectifier & Stator Coil

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 3: Checking Continuity Of Three Diodes

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.