Brush and brush holder

Verify that there is no continuity between each insulated brush and plate using a tester.

Fig 1: Checking Continuity Between Insulated Brushes And Plate Using Tester
Courtesy of MAZDA MOTORS CORP.
- If there is continuity, replace the brush holder.
Measure the brush length.

Fig 2: Measuring Brush Length
Courtesy of MAZDA MOTORS CORP.
- If any brush is worn almost to or beyond the minimum specification, replace all of the brushes.
Starter brush length

Standard: 12.3 mm {0.484 in}

Minimum: 5.5 mm {0.22 in}
Measure the brush spring force using a spring balance.

Fig 3: Measuring Brush Spring Force Using Spring Balance
Courtesy of MAZDA MOTORS CORP.
- If not within the minimum specification, replace the brush and brush holder component.
  Starter brush spring force
  
  Standard: 15.0-20.4 N {1.53-2.08 kgf, 3.38-4.58 lbf}
  
  Minimum: 2.75 N {0.280 kgf, 0.618 lbf}