Alternator Brush: Testing and Inspection
Brush
If brushes are worn to, or beyond limit, replace them.
Standard: 0.85 in (21.5 mm)
Minimum: 0.32 in (8.0 mm)
Brush spring
1. Measure force of brush spring with a spring pressure gauge.
2. Replace the spring if necessary.
Standard force: 0.71 - 0.93 lb-ft (3.1 - 4.1 N.m, 0.32 - 0.42 kg-m)
Minimum: 0.36 - 0.52 lb-ft (1.60 - 2.4 N.m, 0.16 - 0.24 kg-m)
Read spring pressure with brush tip projecting 0.08 in (2 mm).