GMC 1976 ZEO 6083 Maintenance Manual page 720

GENERATOR-TO-
ADAPTER SEALS
ARMATURE (ROTOR)
THROUGH-STUD
BALL BEARING & CLIP
ARMATURE
ASSEMBLY
ENERATOR
MOUNTING
STUDS
GROMMET FOR
OUTPUT LEADS
END BELL
BRIDGE
RECTIFIER
ASSEMBLY
I
A-1659
Figure 83-Armature Ground Test
Figure 82-Generator Components
ONAN MOTOR GENERATOR
24C- 43
winding or a collector ring is grounded to the shaft.
Test both collector rings in this manner, refer to
Figure 83 .
ARMATURE OPEN TEST (FIGURE 84)
Use a 120-volt series test lamp set for this test .
Place one prod on each collector ring . The test lamp
should light. If lamp does not light, armature is open
and must be replaced .
TESTING FIELD WINDINGS FOR
GROUNDS (FIGURE 85)
To test the field assembly for grounds, disconnect
all field leads and use a 120-volt series test lamp set.
Touch one prod to Fl (+) and the other prod to the
frame. Lamp should not light . If lamp lights, field is
grounded and must be replaced . (Test F2 lead in the
same manner .)
TESTING FIELD WINDINGS FOR AN
OPEN CIRCUIT (FIGURE 85)
For this test use either an ohmmeter or a 120-volt
series test lamp set.