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Old 08-05-2018, 05:05 PM   #1
cdub2010
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Location: detroit mi
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need windshield wiper help

My wipers are currently parked at 12 noon. a little background

1977 gmc truck with a updated intermintent wiper switch setup with a newer motor i dont remember what year it is. It all works its just that it parks the blades at 12 noon and starts going counterclockwise so I cant just clock the arms to fix it. A few pics to help.

Not im not really to bright so do I cut and weld the wiper crank arm bracket? Is there another bracket I need to get
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Old 08-05-2018, 06:38 PM   #2
chengny
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Re: need windshield wiper help

Quote:
Originally Posted by cdub2010 View Post
My wipers are currently parked at 12 noon. a little background

1977 gmc truck with a updated intermintent wiper switch setup with a newer motor i dont remember what year it is. It all works its just that it parks the blades at 12 noon and starts going counterclockwise so I cant just clock the arms to fix it. A few pics to help.

Not im not really to bright so do I cut and weld the wiper crank arm bracket? Is there another bracket I need to get
I would check/change the motor before tearing into the linkage. The motor can be changed without pulling the cowling, arms, etc.

Just release the three mounting screws, and gently pull the motor away from the firewall. There is sufficient flex in the wiper linkage to do this. You will see a crankarm with a ball on it that connects to the linkage - leave that (ball joint) connection alone.

The other end of the arm is secured to the motor shaft with a nut. That nut can be released (and the crank pulled off the shaft) by inserting a wrench between the firewall and the wiper motor frame and onto the nut. That is how I disco the arm from the shaft.

But the textbook way is to use the hole provided to release the nut. It is offset quite a bit from the connection. That makes it hard enough. But also, more often than not, I drop the nut down into the depths of the plenum and have to spend a couple of hours fishing it out.

When you go to reassemble the crank on the motor shaft be SURE that they are indexed to each other correctly. By that I mean, it is important that both the motor and wiper arms are in the fully parked position.

The crank arm can go on the shaft in 2 different positions. If the arm is 180 degrees off from the normal angle, it will suck.

The first time you operate the wipers, the blades/wiper arms will work beautifully - except for the fact that they will park at the top of the windshield. You will have to do the job again.

The wiper arms are easy - just push them down to a point where the blades are almost touching the windshield gasket.

To preset the motor to park position, just plug in the wiring harness connections, turn the switch on and run it for a couple of revolutions. Turn the wiper motor off at the switch and then mate the motor shaft to the crank arm.

It might sound wicked involved, but everything will become obvious as you do the replacement. Here are a couple of images that might help:
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Old 08-09-2018, 12:29 AM   #3
gmachinz
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Re: need windshield wiper help

That looks like my 78-83 conversion kit you have there! Did you swap the wiper motor linkage arm bracket with a 78-83 style?
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Old 08-21-2018, 12:54 AM   #4
cdub2010
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Re: need windshield wiper help

Thank for the excellent description of the process. I should have read it more closly as i busted my wiper arm tryinb to remove it. It's a bear to work on with the hood hinge on.

Yes i did get one of your conversion kits gmachinz and it wired in perfectly. Actually the whole thing is top notch as well as your directions. I found a crank arm from a 80 c10 In the junkyard. Now I just need wiper arms as mine got trashed when removing. Back to the junkyard. Ill update next week thanks
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Old 08-21-2018, 01:06 AM   #5
gmachinz
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Re: need windshield wiper help

Awesome!! Well let us know the final result!
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Old 08-26-2018, 06:51 PM   #6
cdub2010
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Re: need windshield wiper help

I got some new wiper arms and it works great now.
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