Brush and brush holder

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Verify that there is no continuity between each insulated brush and plate using a tester.
- If there is continuity, replace the brush holder.
  
  Fig 1: Checking Continuity Between Insulated Brush And Plate Using Tester
  Courtesy of MAZDA MOTORS CORP.
Measure the brush length.
- 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}
  
  Fig 2: Measuring Brush Length
  Courtesy of MAZDA MOTORS CORP.
Measure the brush spring force using a spring balance.
- 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 {0.28 kgf, 0.618 lbf}
  
  Fig 3: Measuring Brush Spring Force Using Spring Balance
  Courtesy of MAZDA MOTORS CORP.