Diagnosis And Testing - Dodge ram truck 3500 1996 Service Manual

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WiPEi AND WASIEFt SYSTEMS 81 - 5
DIAGNOSIS AND TESTING (Continued)
it is turning, the crank arm is not connected to the
output shaft or the linkage is not properly connected.
Replace the faulty linkage assembly and/or properly
connect the crank arm to the motor output shaft.
(4) Connect a voltmeter between the motor termi­
nal L and the ground strap (Fig. 2). I f there is little
or no voltage (less than 1 volt), move the negative
test lead from the ground strap to the battery nega­
tive terminal. I f an increase in voltage is noticed, the
problem is a bad ground circuit. Make sure the motor
mounting is free of paint and that the mounting fas­
teners are tight. I f there is still no indication of volt­
age, the problem is an open in the wiring or a faulty
multi-function switch. I f a small increase (greater
than 3 volts) in voltage is observed, the problem is a
faulty wiper motor assembly.
VOLTMETER W i P E i
Fig. 2 Voitmeter Between Terminal L and Ground
(5) Disconnect the motor wiring connector and
replace the fuse. I f the fuse does not blow, the wiper
motor is faulty. I f the fuse blows, the multi-function
switch or the wiring is at fault.
CONDITION
The wiper motor runs slowly at all speeds.
PROCEDURE
(1) Disconnect the wiring harness connector at the
wiper motor. Remove the wiper arms and blades.
Connect an ammeter between the battery and termi­
nal L on the motor (Fig. 3). I f the motor runs and the
average ammeter reading is more than 6 amps, go to
Step 2. I f the motor runs and the average ammeter
reading is less than 6 amps, go to Step 3.
(2) Check the wiper linkage or pivots for binding
or obstruction. Disconnect the drive links from the
motor. I f the motor now runs and draws less than 3
amps, repair the linkage system. I f the motor contin­
ues to draw more than 3 amps, replace the faulty
motor assembly.
TERMINAL AMMETER
Fig. 3 Ammeter Between Terminal L and Battery
(3) Check the motor wiring harness for a short
between the high and low speed circuits. Connect a
voltmeter or test lamp to the motor ground strap. Set
the wiper/washer switch in the Low position. Connect
the other lead of the voltmeter or test lamp to termi­
nal H of the wiring harness. I f voltage is present,
there is a short in the wiring or multi-function
switch. I f no voltage is present, go to Step 4.
(4) Set the wiper/washer switch i n the High posi­
tion. Move the voltmeter or test lamp lead from ter­
minal H to terminal L of the wiring harness. I f
voltage is present, there is a short i n the wiring or
the multi-function switch.
CONDITION
The wiper motor will run at h i g h speed, but
not at low speed.
The wiper motor will run at low speed, but
not at h i g h speed.
PROCEDURE
(1) I f the motor will not run on high speed, set the
wiper/washer switch i n the High position. Connect a
test lamp between the motor terminal H and a good
ground (Fig. 4). I f the motor will not run on low
speed, set the wiper/washer switch i n the Low posi­
tion. Connect a test lamp between the motor termi­
nal L and a good ground.
(2) I f the test lamp does not light at the motor ter­
minal, there is an open in the wiring or the multi­
function switch. I f the test lamp lights at the motor
terminal, replace the faulty motor assembly.
CONDITION
The wiper motor will keep running with the
wiper/washer switch in the Off position.
PROCEDURE
(1) Disconnect the wiring harness connector at the
motor. Connect a jumper wire from terminal P2 to
terminal L of the wiper motor (Fig. 5).