Inspection (Disassembly And Assembly): Rotor

Measure the resistance between the two slip rings of the rotor coil to check the continuity between them.
Replace the rotor if the resistance is not within the standard value range.

Standard value: 3 - 5 +/-

Fig 1: Measuring Resistance Between Two Slip Rings Of Rotor Coil
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check the continuity between the slip rings and core.
If continuity is present, replace the rotor.

Fig 2: Checking Continuity Between Slip Rings And Core
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.