Pontiac FIREBIRD 1972 Service Manual page 1291

CHASSIS ELECTRICAL 12-2 1
Stop-switch misadjusted or defective.
*With test bulb check voltage with brake pedal
depressed at white wire terminal
in steering column connector. If bulb does
not light, check stop switch for proper
adjustment. If adjustment is OK, replace
stop switch.
WILL NOT TURN OFF
Stop switch misadjusted or defective.
*See stop lamp circuit (Fig. 12-23).
CAUSE
Noisy speedometer cable.
Pointer and odometer inoperative.
Inaccurate reading.
Kinked cable,
Defective speedometer head.
Casing connector loose on speedometer case.
Readjust properly. If switch still malfunctions, replace.
SPEEDOMETER
CORRECTION
Loosen over-tightened casing nuts and
snap-on at speedometer head.
Replace housing and core.
Replace broken cable.
Check tire size.
Check for correct speedometer driven gear.
Replace cable. Reroute casing so that bends have
no less than 6" radius.
Replace or have repaired at authorized service
station.
Tighten connector.
BLKIR
FUSIBLE LINK
EDE
.ED
BULKHEAD
CONNECTOR
FUSE
STOP LAMP
SWITCH
'E
Z A R D
u
DIR. SIG.
4 [ f D K . G R E E N j
BLK.IY EL.
STEERING COLUMN
BODYCONNECTOR
TRUNK
CONNECTOR CONNECTORS
OK. GREEN
PEEN$
. .
GREEN
J
YELLOW YELLOW
FOR VOLTAGE CHECKS CONNECT
12 VOLT TEST BULB BETWEEN
GROUND A N D TEST POINT BEING
CHECKED
Fig. 1 2 - 2 3 Stop Lamp Circuit