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Bench Testing: Diodes

Using an ohmmeter, check continuity of all diodes in both directions. Ensure continuity exists in only one direction. If continuity exists in both directions, diode is shorted. If continuity is NOT present in either direction, diode is open. If any diode is defective, replace entire diode assembly.

TESTING ALTERNATOR DIODES

Positive (+) Lead Negative (-) Lead Continuity
+ Diode Plate Diode Terminals Yes
Diode Terminals + Diode Plate No
- Diode Plate Diode Terminals No
Diode Terminals - Diode Plate Yes