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Bench Testing: Rectifier

  1. Using an ohmmeter, check for continuity between positive side of diode leads and heat sink. If no continuity exists from any positive diode lead to heat sink, replace rectifier assembly.
  2. Reverse ohmmeter leads, and check for continuity between negative side of diodes and heat sink. If continuity exists from any negative diode lead to heat sink, replace rectifier assembly.
  3. Check diode trio (smaller diodes between main diode leads) for continuity in both directions. Continuity should exist in one direction only. If any diode shows continuity in both directions or does not show continuity in either direction, replace diode trio.
  4. Check bearings for noise, looseness or poor lubrication. Check grease seals for cuts, cracks or other deterioration. Replace bearings as needed.
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