Generator Internal Parts: Rotor

Measure the resistance between the slip rings using a ohmmeter.

Fig 1: Measuring Resistance Between Slip Rings Using Ohmmeter
Courtesy of MAZDA MOTORS CORP.
- If not within specification, replace the rotor.
  Generator rotor resistance (between slip rings) [20 °C {68 °F}]
  
  1.9-2.2 ohms
Verify that there is no continuity between the slip ring and core using a ohmmeter.

Fig 2: Checking Continuity Between Slip Ring And Core Using Ohmmeter
Courtesy of MAZDA MOTORS CORP.
- If there is continuity, replace the rotor.
Inspect the slip ring surface condition.
- If the slip ring surface is rough, use a lathe or fine sandpaper to make it smooth.