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Rectifier Test

  1. Remove rectifier from alternator. Adjust ohmmeter to x1 scale. Place one lead on one of rectifier "BAT" blade terminals. Place other lead on each of the 3 stator terminals. See Fig 1 . Reverse leads and repeat test. Note readings in both directions.
  2. Reading of approximately 7 ohms in one direction and no reading with leads reversed should be obtained.
  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 of approximately 7 ohms in one direction and no reading with leads reversed should be obtained. If readings are not correct, replace rectifier.
Fig 1: Testing Rectifier Assembly
G12923Courtesy of FORD MOTOR CO.
NOTE: This is a circuit test only and does not measure capacity value.
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