18. STARTING SYSTEM MXU 300/250 Check for continuity between pairs of the commutator segments and there should be continuity. Also, make a continuity check between individual commutator segments and the armature shaft. There should be no continuity. STARTER MOTOR CASE CONTINUITY CHECK Check to confirm that there is no continuity between the starter motor wire terminal and the motor front cover. Also check for the continuity between the wire terminal and each brush. Replace if necessary. Wire Terminal Measure the length of the brushes. Service Limit (replace if below): 8.5 mm (0.34 in) 18-4