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Diode Assembly

  1. Set ohmmeter on x100 scale. Connect ohmmeter between alternator output terminal and each of 3 stator terminals in turn. See Fig 1. Reverse ohmmeter leads. If ohmmeter indicates continuity in only one direction, go to next step. If ohmmeter indicates continuity in both directions, replace diode assembly.
  2. Connect ohmmeter between negative plate and each of 3 stator terminals in turn. Reverse ohmmeter leads. If ohmmeter indicates continuity in only one direction, go to next step. If ohmmeter indicates continuity in both directions, replace diode assembly.
  3. Connect ohmmeter between Blue wire terminal and each of 3 stator terminals in turn. Reverse ohmmeter leads. If ohmmeter indicates continuity in only one direction, diode assembly is okay. If ohmmeter indicates continuity in both directions, replace diode assembly.
Fig 1: Testing Diode Assembly (Bosch 110-Amp Alternator)
G29438
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