Chevrolet CHEVY VAN G10 SERIES Service Manual page 310

E L E C T R IC A L -B O D Y A N D CHASSIS 12-10
pleted to ground at th e dash sw itch as follows: (R efer to
Figure 14). C urrent flows from the battery thru the ignition
switch to the center term inal o f the w iper term inal board.
From the center term inal, current then passes thru the black
w ith pink stripe lead to the series field coils (Larger dia. w ire)
where it divides and flows thru (1) The shunt field coils to
wiper term inal No. 3 thru the wiring harness to the dash
2
switch to ground; and ( ) the series field-arm ature circuit is
com pleted via w iper term inal No. 1 thru the wiring harness to
the dash sw itch to ground.
" H I" Speed Operation:
Turning the w iper dash sw itch to the " H I" or fast speed
position changes the shunt field coil circuit as follows: (R efer
to Figure 15).
With the dash sw itch in the " H I" speed position, the shunt
field coil current passes thru a
the w iper term inal board to term inal No. 1 and then via the
wiring harness to the dash switch to ground. The arm ature and
series field circuit is also com pleted via the wiring harness from
wiper term inal No. 1 to the dash switch to ground.
DASH
SWITCH
SPLICE
CIRCUIT
BREAKER
S P L I C E ^
MOTOR
S P EE D C IR C U IT )
(L O
20
ohm resistor on the back of
BLACK WITH
PINK STRIPE
SERIES
FIELD
SHUNT FIELD
Fig. 1 4 —LO Speed Circuit
Turning the Wiper "O F F "
T urning the wiper dash sw itch to the " O F F " position opens
the wiper circuits to ground at th e dash switch. If, however,
the w iper blades are in any position o th e r than the norm al
park or o ff position, the w iper m o to r circuits are com pleted to
ground by the wiper m o to r park sw itch as follows: (R efer to
Figure 16).
a. The series field-arm ature circuit is com pleted to ground
via the parking sw itch to th e w iper housing to chassis o f
vehicle.
b. The shunt field coil circuit is com pleted to ground via
w iper term inal No. 3 th ru th e wiring harness to the dash
wiring harness to w iper term inal No. 1, thru the parking
sw itch to ground.
IM P O R T A N T : N ote
during the parking operation bypasses the resistor
causing the w iper to operate in LO Speed. Failure of
the w iper to operate in LO Speed during parking
results in the wiper failing to shut o ff.
12 VOLTS
BATTERY
IGNITION
SWITCH
BLACK
LEGEND
POWER CIRCUIT TO SERIES FIELD
SERIES FIELD AND ARMATURE CIRCUIT
SHUNT FIELD CIRCUIT
that the shunt field circuit
FUSE
WIPER
TERMINAL
BOARD
RESISTOR
20 OHMS
C H E V Y V A N SH O P M A N U A L