Chevrolet 1977 light duty truck, Service Manual

Page: 837 / 861

SPECIFICATIONS
FUSES — CIRCUIT BREAKERS
The w ir in g c irc u its a r e p ro te c te d fro m s h o rt c irc u its b y a c o m b i­
n a tio n o f fu s e s , c ir c u it b re a k e rs , a n d fu s ib le th e rm a l lin k s in th e
w ir in g it s e lf . T his g r e a t ly re d u c e s th e h a z a r d o f e le c t r ic a lly
c a u s e d f ir e s in th e v e h ic le s .
T he h e a d la m p c ir c u its a r e p ro te c te d b y a c ir c u it b r e a k e r in th e
lig h t s w itc h . A n e le c t r ic a l o v e r lo a d on th e b r e a k e r w ill cause
th e la m p s to g o o n a n d o f f , o r in some cases to re m a in o f f .
In a d d it io n to a fu s e , th e w in d s h ie ld w ip e r m o to r is a ls o p r o ­
te c te d b y a c ir c u it b r e a k e r . I f th e m o to r o v e rh e a ts , d u e to
o v e r lo a d in g c a u s e d b y h e a v y s n o w , e tc ., th e w ip e r s w ill re m a in
s to p p e d u n t il th e m o to r co o ls.
Fuses lo c a te d in th e J u n c tio n B lo c k b e n e a th th e d a s h o n th e
d riv e r s s id e a re :
C -K TRUCK
H e a te r , F ro n t A /C , G e n e r a to r W a r n in g
L a m p .................................................................................
Id le S to p S o le n o id , A u x . B a tte r y , R a d io ,
T im e D e la y R e la y , Em ission C o n tro l S o le n o id ,
T ra n s m is sio n D o w n s h ift ( M 4 0 ) .............................
C ig a r e tte L ig h te r , C lo c k , D om e L a m p ,
C a r g o L a m p .................................................................
F uel G a u g e , B ra k e W a r n in g L a m p ,
T e m p e ra tu re W a r n in g L a m p , O il
Pressure W a r n in g Lam p .......................................
C o u rte s y L a m p , R o o f M a r k e r L a m p ,
License P la te L a m p , P a r k in g L am p,
S id e M a r k e r L a m p , T a il L a m p ,
C le a r a n c e Lam p .......................................................
D ir e c tio n a l S ig n a l In d ic a to r L a m p , S to p L a m p ,
T r a ffic H a z a r d ............................................................
In s tru m e n t C lu s te r L a m p , H e a te r D ia l L am p,
R a d io D ia l L a m p , C ru is e C o n tro l L am p,
W in d s h ie ld W ip e r S w itch L a m p .......................
W in d s h ie ld W i p e r / W a s h e r .......................................
C ru is e C o n tro l, R e a r W in d o w A u x . , F uel T a n k ,
T a c h o m e te r, B a c k -u p L a m p , D ir e c tio n a l
S ig n a l In d ic a to r L a m p , D ir e c tio n a l
S ig n a l L a m p , H e a d la m p B u z z e r ..........................
P TRUCK
H e a te r ” , A ir C o n d i t i o n i n g t .....................................
In s tru m e n t C lu s te r L a m p , W in d s h ie ld
W ip e r S w itc h L a m p ..................................................
D ir e c tio n a l S ig n a l I n d ic a to r L a m p , S to p L a m p ,
T r a f f ic H a z a r d ............................................................
Id le S to p S o le n o id , C ru is e C o n tro l'!',
D ir e c tio n a l S ig n a l L a m p , T im e D e la y
R e la y , Em ission C o n tro l S o le n o id ,
T ra n sm issio n D o w n s h ift ( M 4 0 ) ............................. 10 A m p
I n - lin e fuses a re lo c a te d in th e a u x ilia r y h e a te r c irc u its (C -K -P
m o d e ls ) a n d u n d e r h o o d la m p , f r o n t a n d r e a r A /C c irc u its (C -K
m o d e ls )
“ W h e n in c o r p o r a te d b y b o d y b u ild e r
Do n o t use fu se s o f h ig h e r a m p e r a g e th a n th o s e re c o m m e n d e d a b o v e
The f o ll o w i n g w ir in g h a rn e sse s a r e p ro te c te d b y a " f u s ib l e li n k " w h ic h is a
s p e c ia l w ir e in c o r p o r a te d in th e c ir c u it h e a d la m p h i-b e a m in d ic a t o r , h o rn , a i r
c o n d it io n in g h ig h b lo w e r , ig n it io n c irc u its (C -K -P m o d e ls ) s ta rte r s o le n o id
( p u ll - i n a n d h o ld ) c ir c u it (C -K m o d e ls ). S h o u ld a n e le c tr ic a l o v e r lo a d o c c u r, th is
w ir e w i ll f a i l a n d p r e v e n t d a m a g e to th e m a jo r h a rn e s s .
G TRUCK
H e a te r , A
J C
...................................................................... 25 A m p
Id le S to p S o le n o id , C ru is e C o n tr o l,
D ir e c tio n a l S ig n a l L a m p , D ir e c tio n a l
S ig n a l I n d ic a to r L a m p , T ra n sm issio n
D o w n s h ift ( M - 4 0 ) ....................................................... 10 A m p
C ig a r e tte L ig h te r , Dom e L a m p , S p o t Lam p . . . 15 A m p
Fuel G a u g e , B ra k e W a r n in g L a m p ,
T e m p e ra tu re W a r n in g L a m p , G e n e r a to r
W a r n in g L a m p , O il Pressure W a r n in g Lam p 3 A m p
S to p L a m p , T r a ffic H a z a r d ....................................... 15 A m p
A u x ilia r y B a tte r y , B a c k in g L a m p , R a d io
D ia l L am p, R a d io .................................................... 15 A m p
In s tru m e n t C lu s te r L a m p , H e a te r D ia l L am p,
T ra n sm issio n C o n tro l L a m p w ith T ilt W h e e l,
C ru is e C o n tro l L a m p , W /S W ip e r
S w itch L a m p , H e a d la m p B u z z e r ....................... 3 A m p
License L a m p , P a rk in g L a m p , S id e
M a r k e r L a m p , T a il L a m p ....................................... 15 A m p
W in d s h ie ld W i p e r ......................................................... 25 A m p
A n in - lin e fu s e is lo c a te d in th e A m m e te r a n d th e a u x ilia r y
h e a te r c irc u its .
Do n o t use fu se s o f h ig h e r a m p e r a g e r a tin g th a n th o s e re c o m m e n d e d a b o v e
The f o ll o w i n g w ir in g h a rn e sse s a r e p r o te c te d b y a " f u s ib l e li n k " w h ic h is a
s p e c ia l w ir e in c o r p o r a te d in th e c ir c u it, ig n it io n , h o rn a n d h e a d la m p h i-b e a m
in d ic a t o r c irc u its , a i r c o n d it io n in g h ig h b lo w e r . S h o u ld a n e le c tr ic a l o v e r lo a d
o c c u r, th is w ir e w i l l f a i l a n d p r e v e n t d a m a g e to th e m a jo r h a rn e ss.
CIRCUIT BREAKERS
DEVICE OR
C IR C U IT
PROTECTED
M O D ELS AMPERES L O C A T IO N
H e a d la m p a n d
p a r k in g la m p
c ir c u it
C -K -P -G 15 L ig h t
sw itch
T a ilg a t e w in d o w
m o to r
C -K 30
Dash
( fo r w a r d s id e )
R e a r A /C
(C 6 9 o v e rh e a d )
G
35
Dash
( fo r w a r d s id e )
Fuel G a u g e , B ra k e W a r n in g L a m p . . .
License P la te L a m p , P a rk in g L a m p ,
S id e M a r k e r L a m p , T a il L a m p ,
C le a r a n c e L a m p , Id e n t if ic a t io n Lam p
W in d s h ie ld W a s h e r / W i p e r ........................
C ig a r e tte L ig h t e r f , C lo c k t , C o u r te s y !,
Dom e L a m p t ...............................................
A u x ilia r y B a t t e r y f , B a c k -u p L am p,
R a d io .................................................................
20 A m p
15 A m p
20 A m p
4 A m p
20 A m p
15 A m p
4 A m p
25 A m p
15 A m p
25 A m p
3 A m p
15 A m p
3 A m p
15 A m p
25 A m p
15 A m p
15 A m p