Rectifier Test

NOTE: Alternator must be disassembled to inspect rectifier.

1. Using Rotunda 73 Digital Multimeter 105-00051, or equivalent, check for continuity between diode positive leads and heat sink.
2. If no continuity exists for any positive diode lead to heat sink, replace rectifier.
3. Reverse ohmmeter leads and check continuity between diode negative leads and heat sink.
4. If continuity exists from any negative diode lead to heat sink, replace rectifier.
5. Check diode trio (smaller diodes between main diode leads) for continuity in both directions.
6. If any diode does not show continuity in one direction only, replace diode trio.