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When one windshield wiper isn't working like it should it may be a loose nut. The nut is located at the base of the wiper arm. There may a plastic tab covering the top of the wiper joint. You should see the nut when the tab's removed. <br />
Check the nut for tightness. If it's loose the wiper pattern will probably need readjusting. Reset the arm by loosening the nut to where you'll be able to move the arm. Set the arm where you believe the it should be. Tighten the nut and run the wipers. If the wipers are working well with each other, and you're satisfied with the windshield coverage finish tightening the nut. Replace the plastic tab.<br />
If the nut comes loose repeatedly you may want to apply a small amount of threadlock to the threads before readjusting the wioer and tightening. Use only a small amount of threadlock.
Where the wiper arms attach at the base of the windshield, look on the side of the wiper arm for a small lock that can be pulled out with a small screwdriver, lift the wiper arm and slide the lock out as you release the wiper arm which should now stay in the raised position, slide the wioer arm off the shaft where the arm is attached.
remove the arm from the pivot, lift the arm to permit the latch to be
pulled out to the holding position and remove the arm from the pivot
with a rocking motion.
Fig. 1: Mount the wiper blade/arm as shown-Dakota models
Fig. 2: Mount the wiper blade/arm as shown-1994-96 Pick-ups
When installing the arms, the at-rest position of the blades
should be determined before pushing the arm onto the pivot. For Dakota
trucks, the tip of the driver's side blade should be 0.51-2.63 in.
(13-67mm) above the cowl panel and the passenger's side blade should be
0.94-3.06 in. (24-78mm) above the cowl panel. For 1989-93 Pick-ups and
Ramchargers, the driver's side blade should be 1.84 in. (47mm) above the
windshield weatherstripping at the heel of the blade; the passenger's
side blade should be 2.24 in. (57mm) above the weatherstripping. For
1994-96 Pick-ups, the wiper motor must be in the PARK position and the
wiper blade should be about 0.85 in. (22mm) from the upper edge of the
black-out areas at the base of the windshield.
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Loosen the nut on the wiper arm and remove it. Then take that big black plastic piece that is under the wipers on the bottom of the windshield and remove it.
Now you have access to the wiper motors and arms. Remove the nut that holds on the arm, then the two bolts that hold on the motor and remove it.
On mine I lifted up the arm,at the base where its connected to the car there is a little metal tap that sticks out. Pick up on the tab,at the same time release the arm. It should stay up. Then kind of wiggle the base near the tab while pulling up on the arm.It should come right off.Its on a spline like stub.Try to put it back on the same spline teeth it came off of.This keeps the arm in the proper place. Once off its easier to see how the blades come off. Try calling a large auto parts store to see if they have your proper blades. Most large auto parts stores will install the blades for you for free if you buy blades from them.Dont buy the cheapest ones, they dont last.
I hope this helps you.
According to AllData, you don't have to remove the motor to install a new switch. Subsequently, AllData doesn't give direction on wiper arm or motor removal. Here are the only diagrams they give for switch replacement.