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Bench Testing: Diodes

  1. With diode assembly removed and on bench, contact positive diode plate terminal with one ohmmeter probe. Using other ohmmeter probe, contact each of 3 diode leads in same plate. Note ohmmeter reading. Reverse ohmmeter probes, and repeat tests for all diodes.
  2. All diodes should show a low reading in one direction and no reading in opposite direction. If any diode is defective, replace diode/rectifier assembly.