Rotor Open Or Short Circuit Test

Disassemble front housing and rotor from rear housing. Set ohmmeter knob at 1 and calibrate meter. Contact each probe to a rotor slip ring. Meter reading should be 2.4-4.9 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 one meter probe to slip ring and other probe to rotor shaft. Meter reading should be infinite (no needle deflection), reading other than infinite indicates rotor is shorted to shaft. Replace rotor if shorted and cannot be repaired.