Chevrolet 1977 light duty truck, Service Manual

Page: 824 / 861

D I A G N O S I S - WIPER O N VEHICLE
NOTE: Ig n itio n sw itch m u s t be "o n " for all ele ctrical tests.
C O N D I T I O N A P P A R E N T C A U S E
C O R R E C T I O N
1. W ip e r I n o p e ra tiv e o r
i n te r m itte n t
A. B low n fuse
A. L o c a te s h o rt circuit
a n d repair. R e p la c e fuse.
B. O p e n circuit in feed wire
(N o . 2 te rm in a l on w iper
m o to r )
B. L o c a te b ro k e n wire a n d
re p a ir
C. Loose m o u n tin g o f w iper
sw itch
C. T ig h te n sw itch m o u n t i n g
D . D efective w ip e r sw itch
D. R e p la c e sw itch
E. O p en circuit in wire to
w ip e r sw itch (N o . 1 te rm in a l
on w iper m o to r)
E. L o c a te b ro k e n wire
a n d re p a ir
2. W ip e r will n o t s h u t off:
A. W ip e r has b o t h " L o " an d
" H i" speeds
A. G r o u n d e d W ire (N o. 1
te r m in a l on w iper m o to r ) to
w ip e r sw itch
A. L o c a te sh o rt circuit an d
r e p a ir
B. W ip e r has " L o " sp eed only A. D efective w ip e r sw itch A. R e p la c e w ip er sw itch
B. G r o u n d e d wire (N o . 3
te rm in a l on w iper m o to r ) to
w ip e r sw itch
B. L o c a te a n d r e p a ir s h o rt
c ircu it
C. W ip e r has " H i" speed only A. D efective w ip e r switch A. R e p la c e w iper sw itch
B. O p e n circuit in wire (N o. 3
t e r m in a l on w iper m o to r ) to
w ip e r sw itch
B. L o c a te a n d r e p a ir b ro k e n
w ire
3. W ip e r has " H i " sp eed only
A. O p e n circuit in w ire (N o . 3
t e r m in a l on w iper m o to r ) to
w ip e r sw itch
A. L o c a te b ro k e n wire
a n d r e p a ir
4. W ip e r has " L o " speed only
A. G r o u n d e d wire (N o. 3
te r m in a l on w iper m o to r ) to
w ip er sw itch
A. L o c a te sh o rt circuit an d
re p a ir
B. D efective w ip er switch
B. R e p lace w ip e r sw itch
5. B lades do n o t r e tu r n to
full p a r k position
A. L oose w iper g r o u n d stra p
c o n n e c tio n
A. T ig h te n s tra p
c o n n e c tio n