Charging System - Alternator Brush Inspection / Rectifier Test
16-62prose procedureAlternator Brush Inspection
CAUTION
When replacing the brushes, use only a rosin core type solder or solder joints will corrode.
- 1Remove the end cover, then take out the brush holder by removing its 2 screws.
- 2Measure length of the brushes with a vernier caliper.
| Specification | Value |
|---|---|
| Alternator Brush Length - Standard | 15.5 mm (0.61 in) |
| Alternator Brush Length - Service Limit | 5.3 mm (0.21 in) |
Alternator Brush Length - Standard
15.5 mm (0.61 in)
Alternator Brush Length - Service Limit
5.3 mm (0.21 in)
If the brushes are not within the service limit, replace them.
Rectifier Test
NOTE
The diodes are designed to pass current in one direction and block current in the opposite direction. Since the alternator rectifier is made up of eight diodes (4 pairs), each diode must be tested for continuity in both directions; a total of 16 checks.
- 1Check for continuity in each direction, between the B and P (of each diode pair) terminals, and between the E (ground) and P (of each diode pair) terminals. All diodes should have continuity in only one direction.
- 2If any of the 8 diodes fails, replace the rectifier assembly (diodes are not available separately).