Pontiac FIREBIRD 1972 Service Manual page 771

ENGINE ELECTRICAL 6E-9
Fig. 6E-9 Testing Armature For Ground
FRAME AND FIELD
3. Using a 110-volt test lamp, place one lead on each
end
d
shunt coil (Fig. 6E-10). Disconnect shunt coil
ground before check is made. If lamp does not light,
the shunt coil is open and must be replaced.
FIELD COIL
Field coils can be removed from the field frame easily by
use of a pole shoe screwdriver. A pole shoe spreader
should also be used since this prevents distortion of the
field frame. Careful installation of field coils is necessary
to prevent shorting or grounding of field coils as the pole
shoes are tightened into place. Formed insulators are used
to protect the field leads from grounding to frame. These
must be replaced with assembly.
I
The field winding can be checked for an open or a ground
by using a test lamp as follows:
1. Using a 110-volt test lamp, place one lead on each
end of the field coils connected in series (Fig. 6E-8).
If lamp does not light, the field coils are open and
must be repaired or replaced.
2. Using a 110-volt test lamp, place one lead on the
REPLACE BRUSHES
1. Remove brush holder pivot pin which positions one
insulated and one grounded brush.
connector strap and the other on the field frame (Fig.
6E-9). Disconnect the shunt coil ground before check
is made. If lamp lights, the field coils are grounded
and defective c&must be repaired or replaced.
2. Remove brush spring.
3. Replace brushes as necessary.
ASSEMBLE STARTER
1. Assemble overrunning clutch to armature shaft as
follows:
a. Lubricate dkve end of armature shaft with high
melting point grease.
FIELD
FRAME
(GROU
Fig. 6E-10 Testing Field Coils For Open Fig. 6E-1 1 Testing Field Coils For Ground