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8-66
1977 PONTIAC SERVICE MANUAL
Open wiring.
Defective directional signal switch.
Defective light switch.
If taillamps light, check voltage at steering
column connector brown wire. If test bulb
lights on lamp side of connector only,
repair terminal. If taillamps do not
light, check for open wiring between light switch
and battery.
If taillamps light, and test bulb lights on
both sides of steering column connector, replace
directional signal switch.
If taillamps do not light and test bulb lights
at light switch terminal
# 5
but not at #4,
replace light switch.
TURN SIGNAL A N D HAZARD WARNING LAMPS
Turn Signal Inoperative-One Side
CAUSE
CORRECTION
--
-
Bulb out (flasher cannot be heard).
Turn on hazard warning system. If one
or more lamps do not operate, check for
defective bulb.
Open wiring or ground connection.
Turn on hazard warning system. If one
or more lamps do not operate, check for
defective bulb.
Open wiring or ground connection.
Turn on hazard warning system. If one or
more bulbs do not operate, use 12 volt test
lamp to check voltage at lamp socket.
If test bulb lights, repair open ground
connection. If not, repair open wiring between
bulb socket and turn signal switch.
Improper bulb or defective turn signal switch.
Turn on hazard warning system. If all
front and rear lamps operate, check
for improper bulb (1034 instead of 1157).
If bulbs are OK, replace defective turn
signal switch.
Short to ground (flasher can be heard, but no
Locate and repair short to ground by
lamps operate).
disconnecting front and rear circuits
separately.
Turn Sianals Ino~erative-Both Sides
CAUSE
CORRECTION
Open fuse (turn signal).
Defective flasher (located behind instrument
panel near steering column).
Loose Connection.
Turn on hazard warning system. If all lamps
operate, replace turn signal fuse if blown.
If new fuse blows, repair short to ground
between fuse and lamps.
If turn signal fuse is OK, and hazard
warning system will operate lamps, replace
defective turn signal flasher (behind
instrument panel near steering column or
in fuse block).
Secure steering column connector. If test bulb
lights only on one side of purple wire
terminals in connector, clean or tighten
connector contacts.
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