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Rectifier Test

  1. Using an ohmmeter, measure resistance, between each diode lead and upper/lower rectifier bodies (STEP 1 in illustration). 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 (STEP 2 in illustration). 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 Alternator Rectifier
G91H02007Courtesy of GENERAL MOTORS CORP.
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