Table of Contents
Advertisement
6D-20
1977 PONTIAC SERVICE MANUAL
Fig.
6D-22M A, 8, F
and G Series With
"P"
and "Z" V8's. Except 8 0
AMP
Generator
HAUST MANIFOLD
BATTERY CABLE
& ATTACHING PARTS
3645
Fig.
6D-22N 6
Series With "R" and
"K"
V8's, 8 0
AMP
Generator
CAUTION: Do not use high voltage to check
these units such as a 110 volt test lamp.
To replace the rectifier bridge, remove the attaching
screws, and disconnect the capacitor lead. Note the insulator
between the insulated heat sink and end frame. Rectifier
bridges may vary in appearance but are completely
interchangeable in these generators.
STATOR CHECKS
The stator windings may be checked with a 1 10-volt test
lamp or an ohmmeter. If the lamp lights, or if the meter
reading is low when connected from any stator lead to the
frame, the windings are grounded. If the lamp fails to light,
or if the meter reading is high when successively connected
between each pair of stator leads on 10-SI Series, the windings
are open (Fig. 6D-28).
NOTE: Delta windings on 2741 Series cannot be
checked for opens.
A short circuit in the stator windings is difficult to locate
without laboratory test equipment due to the low resistance
of the windings. However, if all other electrical checks are
normal and the generator fails to supply rated output, shorted
stator windings or an open delta winding on 27-SI Series are
indicated. Also, a shorted stator can cause the indicator lamp
to be on with the engine at low speed. Check the regulator
in next section before replacing stator.
BRUSH HOLDER AND REGULATOR
REPLACEMENT
To determine if the regulator is defective, an
approved regulator tester must be used.
After removing the three attaching nuts, the stator, and
diode trio screw (Fig. 6D-27), the brush holder and regulator
may be replaced by removing the two remaining screws. Note
the two insulators located over the top of the brush clips in
Figure 6D-25, and that these two screws have special
insulating sleeves over the screw body above the threads. The
third mounting screw may or may not have an insulating
sleeve. If not, this screw must not be interchanged with either
one of the other two screws, as a ground may result, causing
no output or uncontrolled generator output. Regulators may
vary in appearance but are completely interchangeable in
these generators.
Using voltage regulator tester CTW-1170 (Fig. 6D-29),
it is possible to check the voltage regulator both on the car
and on the bench. It is also possible to use this tester for a
continuity tester. Use the instructions on the tester cover for
testing the regulator on the bench and use the following
instructions for the on car test and the continuity test.
Advertisement
Table of Contents
