Pontiac FIREBIRD 1972 Service Manual page 1289

CHASSIS ELECTRICAL 12-19
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BULKHEAD
CONNECTOR
' 7
FUSE
I
e q
R H PP
L A M r
BULKHEAD
CONNECTOR
BODY
CONNECTOR
LHPARK
-
1
TRUNK
CONNECTOR
FOR VOLTAGE'CHECKS CONNECT
12 VOLT TEST BULB BETWEEN
GROUND AND TEST POINT BEING
CHECKED
Fig. 1 2 - 2 1 Tail, Park or License Lamp Circuit
BOTH L A M P S INOPERATIVE OR INTERMITTENT
Fuse blown.
Loose connection or open circuit.
Neutral-safety switch misadjusted (open when
shift lever is in reverse position).
Defective neutral-safety switch.
Defective Ignition Switch.
*Replace fuse. If new fuse blows, repair
to ground in circuit from fuse through
neutral-safety switch to back-up lamps.
*Secure all connectors. If OK, check continuity
by voltage checking circuit from fuse to lamps with
test bulb. If test bulb does not light on either
either side of fuse, check open circuit from
battery to fuse.
Adjust
*With ignition on, check voltage at terminals with
switch in back-up position. If bulb lights at pink wire
terminal but not at light green wire terminal, replace
neutral-safety switch.
*If test bulb lights at ignition switch battery terminal
but not at output terminal, replace ignition switch.
L A M P S WILL N O T TURN OFF
Neutral-safety switch misadjusted (closed
when shift lever is not in reverse position).
*See back-up lamp circuit (Fig. 12-22).
Adjust