GMC 1976 ZEO 6083 Maintenance Manual page 580

9- 48 STEERING
STEERING COLUMN TROUBLE DIAGNOSIS (Cont'd .)
Condition Possible Cause
Correction
B. Loose chassis to column B . Connect securely .
connection .
C. Inoperative turn sig- C. Replace turn signal switch .
nal switch .
D. To determine if turn D. Replace signal switch .
signal switch is defec-
tive, substitute new
switch into circuit and
operate switch by hand .
If the vehicle's lights
operate normally, signal
switch is inoperative.
E. If the vehicle's E. Repair chassis wiring as required
lights do not operate, using manual as guide.
check light sockets for
high resistance connec-
tions, the chassis wiring
for opens, grounds, etc.
Front or rear turn sig- A. Burned out or damaged A. Replace bulb .
al lights not flashing . turn signal bulb .
B . High resistance con- B. Remove or repair defective
nection to ground at bulb connection .
socket .
C. Loose chassis to column C. Connect securely .
connector.
D. Disconnect column to D. Replace turn signal switch .
chassis connector. Connect
new switch into system and
operate switch by hand .
If turn signal lights are
now on and flash, turn
signal switch is inoper-
ative.
E. If vehicle lights do E. Repair chassis wiring as required
not operate, check chassis using manual as guide.
wiring harness to light
sockets for opens,
grounds, etc.
Stop light not on when A. Loose column to chas- A. Connect securely .
turn indicated sis connection .
B. Disconnect column to B. Replace signal switch.
chassis connector. Con-
nect new switch into sys-
tem without removing old.
Operate switch by hand .
If brake lights work with
switch in the turn posi-
tion, signal switch is
defective.
C. If brake lights do not C. Repair connector to stop light
work check connector to circuits using manual as guide.
stop light sockets for
grounds, opens, etc.