Honda Acura NSX 1991 Service Manual page 1094

Charging System
Rectifier Test
NOTE:
tion 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.
1 . Check for continuity in each direction, between the
the E (ground) and P (of each diode pair) terminals.
All diodes should have continuity in only one direc-
tion.
2 . If any of the 8 diodes fails, replace the rectifier as-
sembly. (Diodes are not available separately.)
P 4
B
0
0 P3 P 3
P 4
1 . Remove the end cover, then take out the brush
holder by removing its 2 screws.
2 . Measure 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)
VERNIER CALIPER
If the brushes are not inside the service limit, replace the
brushe holder assembly.
ALTERNATOR BRUSH