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Rectifier (Diode) Tests

NOTE: DO NOT  break plastic cases of diodes, cases are for protection against corrosion. Always touch test probe to metal strap nearest diode.
  1. Remove nuts from studs on terminal block securing stator windings and positive and negative rectifier straps.
  2. Test rectifiers with a 12 volt battery and test lamp equipped with a No. 67 bulb. Connect one test lamp lead to positive battery post and other lead to end of a test probe.
  3. Attach second probe to battery negative terminal. Measure rectifier continuity with probes touching heat sink and rectifier top strap.
  4. Now reverse probes. If lamp lights with current flow in one direction only, rectifier is satisfactory. If lamp lights with probes either way, rectifier is shorted.
  5. If lamp does not light either way, rectifier is open. Test each rectifier in both assemblies. Replace defective rectifiers. Lamp should light in same direction for all rectifiers of each assembly.
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