Field Coil Test

Check for continuity between the end of the field coil and yoke body. See Fig 1. Replace the field coil, if there is continuity.

Fig 1: Checking Continuity Between Coil & Yoke
Courtesy of ISUZU MOTOR CO.
Check continuity between the lead wire of terminal "C" and brush. See Fig 2. Replace yoke assembly if there is no continuity.

Fig 2: Checking Continuity Between Terminal "C" & Brush
Courtesy of ISUZU MOTOR CO.