Pontiac FIREBIRD 1972 Service Manual page 1290

12-20 1972 PONTIAC SERVICE MANUAL
f
spL% IGN. SWITCH
TO BATTERY
+
SOL.
0
FUSIBLE BAT. BAT.
LINK BULKHEAD
CONNECTOR
FUSE BLOCK
DIR. SIG. FLASHER
DIR. SIG. A N D
BACK-UP FUSE
BODY TRUNK
CONNECTOR
FOR VOLTAGE CHECKS CONNECT
12 VOLT TEST BULB BETWEEN
GROUND A N D TEST POINT BEING
CHECKED.
BACK-UP
LAMP R.H.
BACK-UP
- 1
LAMP L.H.
CAUSE
Bulh out.
Fig. 1 2 - 2 2 Back-up Lamp Circuit
STOP LAMPS DIAGNOSIS
ONE BULB INOPERATIVE
Stop-hazard fuse blown.
CORRECTION
Replace bulb.
Loose connection, open wiring or defective
bulbs.
Defective directional signal switch or
cancelling cam.
ONE SIDE INOPERATIVE
*Turn on direction signal. If lamp does not
operate, check bulbs. If bulbs are OK, secure all
connections. If lamp still does not operate,
check for open wiring with a test bulb.
*If lamp will operate by turning on directional
signal, the switch is not centering properly
during cancelling operation. Replace defective
cancelling cam or direction signal switch.
ALL INOPERATIVE
*Replace. If new fuse blows, repair short
to ground in circuit between fuse and lamps.