Alternator & Regulator: Testing: Rotor

Using an ohmmeter, inspect rotor for an open circuit and check for continuity between slip rings. If there is no continuity, replace rotor. Inspect rotor for ground and check that there is no continuity between slip ring and rotor. If there is continuity, replace rotor. Check that slip rings are not rough or scored. If slip rings are rough or scored, replace rotor.