Chevrolet 1977 light duty truck Service Manual page 212

C O N D ITIO N
T u rn signal w ill not cancel
T u rn signal d iffic u lt
to operate
T u rn signal w ill not
indicate lane change
T u rn signal w ill not stay
in tu rn position
Hazard switch cannot
be tu rn ed o ff
SIGNAL SWITCH DIAGNOSIS
POSSIBLE CAUSE
A. Loose switch
m ounting screws
Sw itch or anchor
B.
bosses broken
B roken, missing or o ut
C.
o f position d ete n t, retu rn
or cancelling spring
D. U neven o r incorrect
cancelling cam to
cancelling spring
interference.
( .1 2 0)/sid e
A.
A c tu a to r rod loose
B. Y o k e broken or
distorted
C. Loose o r misplaced
springs
D. Foreign parts
a n d /o r materials
E. S w itch m ounted
loosely
A. Broken lane change
pressure pad or
spring hanger
B. B roken, missing or
misplaced lane change
spring
C.
Jamm ed base o r wires
A . Foreign m aterial or
loose parts impeding
m ovem ent of yo k e
B. Broken or missing
detent or cancelling springs
C. N one o f th e above
A. Foreign m aterial
between hazard
support cancelling
leg and yoke
CORRECTION
A.
T ig h ten to specified
to rq u e (2 5 in-lbs)
B. Replace switch
R eposition o r replace
C.
springs as required
D. A djust switch position
1. If interference is
correct and switch
w ill still not cancel,
replace switch.
2. If interference
cannot be corrected
by switch
adjustm ent, replace
cancelling cam.
T ig h ten m ou n ting
A.
screw (1 2 in-lb)
Replace switch
B.
R eposition or replace
C.
springs
D. Remove foreign parts
a n d /o r m aterial
E. T ig h ten m ou n ting
screws ( 2 5 in-lbs)
A. Replace switch
B. Replace o r reposition
as required
C. Loosen m ou n ting
screws, reposition
base o r wires and
retighten screws(2 5 in-lbs)
A. Remove m aterial
a n d /o r parts
B. Replace spring
C. Replace switch
A. Remove foreign m aterial
1. No foreign m aterial
im peding fu n c tio n
o f hazard switch
— replace tu rn
signal switch