Starter Motor: Testing and Inspection

ARMATURE COIL GROUND TEST
Using an ohmmeter, check to make sure that there is no continuity between the commutator and the armature coil core. If there is continuity, replace armature assembly.




ARMATURE COIL SHORT-CIRCUIT TEST
Test the armature coil in a growler. Replace the coil if there are signs of a short. If the blade attached to the core vibrates while the core is turned, the armature is shorted.




ARMATURE COIL OPEN-CIRCUIT TEST
Using an ohmmeter, check for continuity between the commutator segments. if there is no continuity, the commutator segments are open. Replace the armature assembly.




FIELD COIL OPEN-CIRCUIT TEST
Using an ohmmeter, check the filed coil for continuity. If there is no continuity, the field coil is open. Replace the field coil assembly.




FIELD COIL GROUND TEST
With the field coil mounted to the yoke, check for continuity between the field coil and the yoke using an ohmmeter. If there is continuity, replace the field coil.




BRUSH
A brush worn down to the wear limit line should be replaced.




BRUSH HOLDER
Check for continuity between the (+) side brush holder and brush holder base. If there is continuity, replace the holder assembly.




OVERRUNNING CLUTCH
Inspect the pinion and spline teeth for wear or damage. Replace if damaged. Also inspect the flywheel ring gear for damage.