Brush Holder

Check movement of each brush in holder. If brush movement within brush holder is sluggish, check brush holder for distortion and sliding surfaces for contamination.
Clean or correct brush holder as necessary.
Check for continuity across insulated brush (positive (+) side) and grounded brush (negative (-) side).
If continuity exists, brush holder is grounded due to defective insulation and should be replaced.

Fig 1: Checking Brush Holder Continuity
Courtesy of SUZUKI OF AMERICA CORP.