Field Coil: Testing and Inspection

Field Coil Open-circuit Test (Direct Drive Type Only):

FIELD COIL OPEN-CIRCUIT TEST (Direct Drive Type Only)
Check the continuity between field brushes. If there is continuity, the field coil is in order.

Field Coil Ground Test (Direct Drive Type Only):

FIELD COIL GROUND TEST (Direct Drive Type Only)
Check the continuity between field coil brush and yoke. If there is no continuity, the field coil is free from grounding.