Denso

Alternator Brush Inspection
1. Remove the end cover, then take out the brush holder by removing its two screws.

(Denso):

2. Measure the length of the brushes with a vernier caliper.

Alternator Brush Length:
Standard: 10.5 mm (0.41 in)
Service Limit: 1.5 mm (0.06 in)

If the brushes are less than the service limit, replace the brush holder assembly.