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Repair Procedures: Inspection: Rotor

Check that there is continuity between the slip rings (C).
Check that there is no continuity between the slip rings and the rotor (B) or rotor shaft (A).

Fig 1: Identifying Slip Rings, Rotor, & Rotor Shaft
Courtesy of KIA MOTORS AMERICA, INC.
If the rotor fails either continuity check, replace the alternator.