GMC 1976 ZEO 6083 Maintenance Manual page 722

CAUTION : All terminals are marked on both
bridge rectifier and nylon case. Observe
proper polarity when installing. If installed
wrong, generator voltage will not build up.
COLLECTOR RINGS
Collector rings acquire a glossy brown finish in
Figure 86-End Bell Assembly
ONAN MOTOR GENERATOR 24C- 4 5
COMPOUNDING
REACTOR
TORQUE TO
40-70 INCH LBS .
LOAD WIRES
BRUSH BLOCK ASSEMBLY
40-70 IN-LB TORQUE A-1663
normal operation. Do not attempt to maintain a
bright, newly machined appearing surface. Ordinary
cleaning with a dry, lint-free cloth is usually suffi-
cient. Very fine sandpaper ($240) may be used to
remove slight roughness. Use only light pressure on
the sandpaper, while the plant is running. Do not use
emery or carborundum paper or cloth . Clean out all
carbon dust from the generator.
Figure 87-Testing Bridge Rectifier