All Lamm Inoperative; Tail, Park Or License Lamps; One Side Inoperative; Both Sides Inoperative - Pontiac TRANS AM 1977 Service Manual

8-68 1977 PONTIAC SERVICE MANUAL
All Lamm Inoperative
CAUSE CORRECTION
Fuse blown. If park and taillamps do not operate,
replace tail fuse if blown. If new fuse
blows, check for short to ground between
Loose connection.
Open wiring.
Defective light switch.
fuse panel and lamps.
Secure connector to light switch.
Check voltage at tail fuse with test bulb.
If bulb lights, repair open wiring between
fuse and light switch. If not, repair
open wiring between fuse and battery. (Possible
open fusible link.)
If test bulb lights at light switch
terminal #5 but not at terminal #4, replace
light switch.
TAIL, PARK OR LICENSE LAMPS
One Side Inoperative
CAUSE CORRECTION
Bulb out. Replace.
Open ground connection at bulb socket or Jumper bulb base socket connection to
ground wire terminal. ground. If lamp lights, repair open
ground circuit.
Both Sides Inoperative
CAUSE CORRECTION
Tail lamp fuse blown.
Loose connection.
Open wiring.
Multiple bulb burnout.
Defective light switch.
Replace fuse. If new fuse blows, repair
short to ground in brown wire circuit between
fuse panel through light switch to lamps.
Secure connector at light switch.
If test bulb does not light on either side
of fuse, repair open circuit between fuse
panel and battery. (Possible open fusible
link.) If test bulb lights at light switch
brown wire terminal #5, repair open wiring
between light switch and lamps.
If test bulb lights at lamp socket brown
wire terminal replace bulbs.
If test bulb lights at light switch terminal
#4 (browdwhite) but not at terminal
#5 (brown), replace defective light switch.