Pontiac FIREBIRD 1972 Service Manual page 777

ENGINE ELECTRICAL 6E- 15
FIG. M
DISASSEMBLY
9. Stop engine, remove generator, mark end
frames with punch (Fig. M ) and separate
end frames.
BRUSH
-HOLDER REGUbATOR
/
8
WASHER
GROUNDED
I
HEAT SINK
OHMMETER
10. Check rectifier bridge (Fig. N). See 1971
Pontiac Service Manual, Section 6E f o r pro-
cedure.
NOTE: Rectifier bridge must be checked
while installed i n end frame.
As generator is disassembled, observe loca-
tion of t w o insulating washers and screws
that attach voltage regulator and brush hold-
er t o end frame (Fig. 0 ) .
OR WORN INSULATION
FIG.
0
,INSULATING
SCREWS
FIG. P
Also observe insulating washer under "recti-
fier bridge".
Check f o r cracked or broken
insulators (Fig. P).
Visually inspect brushes and holder for
cracks, dirt or worn brushes.
Check f o r good contact between diodes and
contacts.
11. Check diode t r i o (Fig. 0 ) . See 1971 Pon-
tiac Service Manual, Section 6E, for proce-
dure.
Visually check stator for discoloration of
"enamel coating" on copper wire. Color
should be constant. Excessive heat or short
between turns will tend t o turn enamel
coating "black" and will be easy t o r u b off.
I f enamel can be easily rubbed off, replace
stator (Fig.
R).
Fig. 6E-20 SI Diagnosis (C)