Brush Assembly

Ensure brushes slide freely in brush holder. If brushes do not slide freely, check for dirt or contamination. Clean brushes and recheck operation. Replace brushes if brushes still do not slide freely.
To check brush holder for a ground, use ohmmeter and check for continuity between insulated brush holder and grounded brush holder. See Fig 1 . No continuity should exist. Replace brush holder if continuity exists.
Inspect brushes for cracks. Using caliper, measure brush length. Replace brush if brush length is not within specification. See STARTER SPECIFICATIONS table under STARTER SPECIFICATIONS.

Fig 1: Testing Typical Brush Holder For Ground

Courtesy of HYUNDAI MOTOR CO.