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Home >> Ford >> 1993 >> Taurus SHO, 3.2 P, AXODE >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator - MOTORCRAFT W/Integral Regulator >> Bench Testing (External Fan) >> Rectifier Assembly Test >> External Fan

External Fan

  1. Remove rectifier assembly from alternator. Set ohmmeter to X1 range. Connect one ohmmeter probe to "B+" terminal. Connect other ohmmeter probe to each of 3 stator lead terminals in turn. See Fig 1.
  2. Reverse probes and repeat test. All diodes should have resistance of approximately 7 ohms in one direction, and infinite resistance with probes reversed.
  3. Repeat test for negative set of diodes by connecting one ohmmeter probe to rectifier assembly base plate, and contacting each of 3 stator lead terminals with other ohmmeter probe. See Fig 1. If resistance is not as specified in step 2), replace rectifier assembly.
Fig 1: Testing Rectifier Assembly (External Fan)
G106368Courtesy of FORD MOTOR CO.
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