Pontiac FIREBIRD 1972 Service Manual page 776

6E-14 1972 PONTIAC SERVICE MANUAL
4 Connect the voltmeter t o e ~ t h e r one of the
follow~ng locat~ons
a. T o the number 2 term~nal on the genera
tor and t o ground (Fig. D).
b. T o clgar l~ghter outlet uslng a agar l~ghter
adapter (System battery voltage should ap
pear on the voltmeter).
W ~ t h the voltmeter connected as In (a) or
(b) above, perform the followmy checks:
5. Start engine and let
it
warm up, set idle
(in "Park") at 1000 rpm for test. During
' FIG. H
cranking the voltage will drop below System
Battery Voltage
-
this is normal.
6. Observe voltmeter.
7. I f voltmeter reading is:
than 15.5 volts ( ~ i ~ : I )
-
Fegulator is
functioning normally
-
proceed t o step 8.
FIG. I
c. Greater than 15.5 volts (Fig. J)
-
Regula-
tor shorted
-
proceed t o SI Generator
disassembly diagnosis chart (Fig. 6 ~ - 2 0 ) .
NOTE: I t will be necessary t o correct genera-
tor malfunctim before determining
the condition of the voltage regulator.
that one or more areas of the generator are
defective, proceed with disassembly and
checking as described in Fig. 6 E - 2 0 . .
FIG. J
FIG. K
8. a. Disconnect energizer ground strap.
b. Disconnect red wire from BAT. termi-
nal on Delcotron.
c. Connect ammeter black lead t o red wire
and red lead t o BAT. terminal, Fig. K.
d. Connect energizer ground strap.
e. Turn on all accessories, lights on high
beam, and blower on high speed.
f . Run engine as required t o obtain maxi-
mumcurrent output and record ammeter
reading. * I f battery i f fully charged,
use the starter t o partially discharge i t
before recording maximum current out-
put.
6
1) Output within 1 0 amps of rated out-
put stamped on Delcotron frame.
Replace Regulator
2) Output NOT within 10 amps of rated
output stamped on Delcotron frame.
g. Insert screwdriver into test hole (Fig. L ) .
End of screwdriver must touch tab and
side of screwdriver ground against end
frame. Run engine as before and recheck
output.
1) Output within 1 0 amps of rated out-
put stamped o n Delcotron frame.
N O R M A L
Recheck battery t o make sure i t is i n
good condition.
2) Output NOT within 1 0 amps of rated
output stamped on Delcotron frame.
GENERATOR DEFECTIVE
INSERT SCREWDRIVER
T A D
GROUND TAB TO
FIG. L
---
Fig.
6E-19 SI
D i a g n o s i s
(B)