Dodge RAM TRUCK 1500 1995 Service Manual page 477

8K - 4 WIPER AND WASHER SYSTEMS _
VOLTMETER WIPER
Fig. 1 Voltmeter Between Terminal L and Ground
(5) Disconnect motor wiring connector and replace
fuse. If fuse does not blow, motor is defective. If fuse
blows, wiper/washer switch or wiring is at fault.
CONDITION
Motor r u n s slowly at all speeds.
PROCEDURE
(1) Disconnect wiring harness connector at motor.
Remove wiper arms and blades. Connect an ammeter
between battery and terminal L on motor (Fig. 2). If
motor runs and average ammeter reading is more
than 6 amps, continue to next step. If motor runs
and average ammeter reading is less than 6 amps, go
to step 3.
(2) Check wiper linkage or pivots for binding or ob­
struction. Disconnect drive link from motor. If motor
now runs and draws less than 3 amps, repair linkage
system. If motor continues to draw more than 3
amps, replace motor assembly.
(3) Check motor wiring harness for short between
high and low speed circuits. Connect a voltmeter or
test lamp to motor ground strap. Set wiper/washer
switch to LOW position. Connect other lead of volt­
meter (test lamp) to terminal H of the wiring har­
ness. If voltage is present, there is a short in the
wiring or wiper/washer switch. If no voltage is
present, go to next step.
Fig. 2 Ammeter Between Terminal L and Battery
(4) Set wiper/washer switch to HIGH position.
Move voltmeter (test lamp) lead from terminal H to
terminal L of the wiring harness. If voltage is
present, there is a short in the wiring or wiper/
washer switch.
CONDITION
Motor will run at high speed, but not at low
speed.
Motor will run at low speedy but not at high speed.
PROCEDURE
(1) If motor will not run on high speed, put wiper/
washer switch in HIGH position. Connect a test lamp
between motor terminal H and ground (Fig. 3). If mo­
tor will not run on low speed, put wiper/washer
switch in LOW position. Connect a test lamp between
motor terminal L and ground.
TERMINAL
T E S T
Fig. 3 Test Lamp Between Terminal H and Ground
(2) If test lamp does not light at motor terminal,
there is an open in wiring or wiper/washer switch. If
test lamp lights at motor terminal, replace motor as­
sembly.
CONDITION
Motor will keep running with wiper/washer
switch in OFF position.
(4) Connect a voltmeter between motor terminal L
and ground strap (Fig. 1). If there is little or no volt­
age (less than 1 volt), move negative test lead from
the ground strap to battery negative terminal. If an
increase in voltage is noticed, the problem is a bad
ground circuit. Make sure the motor mounting is free
of paint and that mounting fasteners are tight. If
there is still no indication of voltage, the problem is
an open in wiring or faulty wiper/washer switch. If a
small increase (greater than 3 volts) in voltage is ob­
served, the problem is a faulty motor assembly.