Rotor Open Or Short Circuit Test
- Remove and disassemble alternator. Remove rotor. Set ohmmeter to "x1" range. Contact each probe to one rotor slip ring. Meter should read 2.0-3.9 ohms. Higher reading indicates damaged slip ring solder connection or broken wire.
- Lower reading indicates shorted wire or slip ring. Replace rotor if damaged. Contact ohmmeter probe to one slip ring and other probe to rotor shaft. Ohmmeter reading should be infinite. Readings other than infinite indicate rotor is shorted to shaft. Replace rotor if shorted.