Pontiac FIREBIRD 1972 Service Manual page 778

6E- 16 1972 PONTIAC SERVICE MANUAL
13. Inspect "Y" connection (on "10SI" only)
for good connection plus discoloration of
wires atlor near the joint. Excessive dis-
coloration usually indicates poor welding of
this connector. Check'for a short between
coil windings and frame laminations (Fig.
S).
FIG. S
OHMMETER
(CHI C K
101 O ~ N S )
t c w c r
m~
wouthsj
FIG. T
Check stator for opens or grounds (Fig. T ) .
16. Reinstall on car, adjust belt tension and
start engine.
14. Check rotor (Fig. U ) .
15. Use a wooden plastic toothpick t o retain
brushes and reinstall regulator and brush
assembly i n end frame, fitting toothpick
through slot i n end frame. Reassemble
generator carefully observing proper loca-
tion of the t w o insulating washers and
screws at the voltage regulator and
insula-
t & washer under rectifier bridge (Fig. V ) .
17.
With car running slightly above idle, repeat
test
7
and
8
t o ensure a normal functioning
charging system.
NOTE: I f both the alternator and regulator are
defective simultaneously, it will be
necessary t o rebuild the alternator
and rerun the preceding tests.
FIG. U
FIG. V
Fig.
6E-20A SI
D i a g n o s i s (D)