Chrysler RAM TRUCK 2500 1994 Service Manual page 472

• WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 3
CONDITION
Motor will not ran in any switch position.
P R O C E D U R E
(1) Check for a blown fuse in the fuseblock module.
(a) If fuse is good, proceed to step (2).
(b) If fuse is defective, replace and check motor
operation in all switch positions.
(c) If motor is still inoperative and the fuse does
not blow, proceed to step (2).
(d) If replacement fuse blows, proceed to step (5).
(2) Place switch in low speed position.
(3) Listen to motor. If you cannot hear it running,
proceed to step (4). If you hear it running, check mo­
tor output shaft. If output shaft is not turning, re­
place motor assembly. If it is turning, crank arm or
drive link is not properly connected. Replace worn
parts and/or properly connect drive link to the motor
output shaft.
(4) Connect a voltmeter between motor terminal
"IT and ground strap (Fig. 1). If there is no voltage or
very little voltage (less than one volt) present, move
negative test lead from the ground strap to battery
negative terminal.
VOLTMETER WIPER
Fig. 1 Voltmeter Between Terminal "L" and Ground
(a) If an increase in voltage is noticed, the prob­
lem is a bad ground circuit. Make sure the motor
mounting is free of paint and that nuts or bolts are
tight.
(b) If there is still no indication of voltage, the
problem is an open circuit in the wiring harness or
wiper switch.
(c) If no noticeable increase (greater than 3 volts)
in voltage is observed, the problem is a faulty mo­
tor assembly.
(5) Disconnect motor wiring connector and replace
fuse.
(a) If fuse does not blow, motor is defective.
(b) If fuse blows, switch or wiring is at fault.
CONDITION
Motor runs slowly at all speeds.
P R O C E D U R E
(1) Disconnect wiring harness connector at motor.
Remove wiper arms and blades. Connect an ammeter
between battery and terminal "L" on motor (Fig. 2).
Fig. 2 Ammeter Between Terminal "L" and Battery
(a) If motor runs and average ammeter reading
is more than 6 amps, proceed to step (2).
(b) If motor runs and average ammeter reading
is less than 6 amps, proceed to step (3).
(2) Check to see if wiper linkage or pivots are bind­
ing or caught. Disconnect drive link from motor.
(a) If motor now runs and draws less than 3
amps, repair linkage system.
(b) If motor continues to draw more than 3 amps,
replace motor assembly.
(3) Check motor wiring harness for shorting be­
tween high and low speed wires as follows:
(a) Connect a voltmeter or test lamp to motor
ground strap.
(b) Set wiper switch to LOW position.
(c) Connect other lead of voltmeter (test lamp) to
terminal "W of the wiring harness.
(d) If voltage is present, there is a short in the
wiring or wiper switch. If no voltage is present?pro-
ceed to step (e).
(e) Set wiper switch to HIGH position.
(f) Move voltmeter (test lamp) lead from terminal
a H" to terminal "IT of the wiring harness.
(g) If voltage is present, there is a short in the
wiring or wiper switch.
CONDITION
Motor will r u n at high speed, but not at low
speed. Motor will r u n at low speed, but not at
high speed.