Assembly Test
- Check field slip rings for excessive wear or roughness. If slip ring has only minor damage, clean with fine emery cloth. If slip rings are badly damaged, rotor must be replaced.
- Using an ohmmeter, test for continuity from one slip ring to other. Test should show closed circuit.
- Using an ohmmeter, test for continuity from both field coil slip rings to rotor shaft or core. Test should show open circuit. If failure is detected in either test, replace rotor assembly.