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Rectifier Test

  1. Using an ohmmeter, measure resistance, between each diode lead and upper/lower rectifier bodies. Perform STEP 1. See Fig 1 . Check resistance in both directions by reversing ohmmeter leads. Resistance should be greater than 5 ohms in one direction and less than 5 ohms in the other direction. If resistance does not exist or exists in both directions, replace rectifier.
  2. Using an ohmmeter, measure resistance between diode trio leads. Perform STEP 2. See Fig 1 . Resistance should be greater than 5 ohms in one direction and less than 5 ohms in the other direction. Replace rectifier is resistance is not as specified.
Fig 1: Testing Generator Rectifier
G91H02007Courtesy of GENERAL MOTORS CORP.