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Bench Testing: Rectifier

  1. Remove rectifier from alternator. Adjust ohmmeter to lowest scale. Place one lead on one of rectifier BAT terminals. Place other lead on each of the 3 stator terminals. See Fig 1 .
  2. Reverse leads and repeat test. Note readings in both directions. Reading should be approximately 7 ohms in one direction and no reading with leads reversed.
  3. Place one lead on rectifier base plate and remaining lead on each of the 3 stator terminals. This is done to test negative diodes. Reverse leads and repeat test.
  4. Reading should be approximately 7 ohms in one direction and no reading with leads reversed. If readings are not correct, replace rectifier.
Fig 1: Testing Rectifier Assembly
G12923Courtesy of FORD MOTOR CO.
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