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MOTORCRAFT Alternators: Overhaul: Testing

  1. Using 12 volt test lamp, check rotor continuity at slip rings and absence of ground between slip ring and rotor shaft. With ohmmeter, check for resistance of 4.0 to 4.4 ohms between slip rings.
  2. Check resistance of 0.14 to 0.16 ohms between stator wires with ohmmeter. Check that windings are not grounded and have winding continuity with 12 volt test lamp.
  3. Check diodes for continuity (approximately 60 ohms) in one direction only. If no continuity is observed in either direction, diode is open. If continuity is observed in both directions, diode is shorted. Rectifier assembly must be replaced if open or shorted diodes are found.
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