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Wiper - park function not working

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Eliteman76 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Topic: Wiper - park function not working
    Posted: 04-May-2011 at 5:59AM
OK. Looking for advice:
Replaced my fried wiper motor.
The wiper park function, is not working with the motor I have now.
 
For those unsure of what I mean, on every Torino I have owned, the wiper setup on the 72-76 when turned on, will raise up like 6 inches, then proceed to work.
 
I had swapped motors, and I can't get the park function to work now.
I have tried three different wiper delay sets, at least two standard switches and nothing, all act the same.
 
Would this be related to the contact block in the wiper motor itself?
 
I thought the wiper motor I had had a different crank assembly, but comparing the two side by side, not the case.
 
 
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 04-May-2011 at 6:06AM
Check the ground strap between the plastic cover, motor, and case. They usually corrode, and the wipers will not park. 
Paul
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Post Options Post Options   Thanks (0) Thanks(0)   Quote crispy23c Quote  Post ReplyReply Direct Link To This Post Posted: 04-May-2011 at 6:54AM
I think there are 2 different wiper motors available - one with the park feature, and one without.  Could have sworn I saw that mentioned somewhere...
Chris P. '73 GTS FastBack 351CJ-4V Triple black


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Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 04-May-2011 at 9:25AM
Here's some info I pulled off another site about 1970 Mustang wiper not parking.  I don't believe the wiper motors are exactly the same as those for 72-79 Torino/Ranchero, but possibly may lead to a solution?   
Paul~
 
I took my wiper motor apart to clean and relube it and now it doesn't park. Not sure if it did before or not since it was in abox with the car when I got it. So I could take the easy way out and just go buy one from OReilly's but that just isnt me. To go buy another one admits defeat.

The book doesnt explain the theory, only testing and replacement. The unit motors thru ok. Blue and white are the high and low speed wires ad I presume it does this thru resistance wires. What I dont understand is what is happening electrically when it is in park cycle. Apparently the white wire is grounded while power is still applied to the motor over the blue or white wire? I've taken it apart a few times now and dont see how this should operate. Please someone dumb it down for me.

Here is the park bench test (no pun intended) diagram. Will post some pics of the brush and switch plate.
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Offline johnpro

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    Re: 1970 Mach 1 wiper motor theory and operation
    « Reply #1 on: June, 20, 2010, 09:52:45 PM »
    They are very simple, actually.  You should see a set of contact points inside the motor, much like the mechanical voltage regulator, or actual distributor points. 

    Now the motor actually has 2 power wires going to it.  One supplies power to the motor all the time that the key is in accessories or run.  The other only has power when the wiper switch is on.  With the wiper switch on, it allows power to by-pass the points and even though the points are opening and closing (there's a little cam in there that opens and closes them as the motor turns), the opening points have no effect, because of the by-passed wire.

    Then when you turn the switch off, the motor keeps turning until the points open, killing power to the motor and the wipers turn off.  It's all set up so that when the points open, the wipers are in the "parked" position.  This is how they continue to run until the parked position, then stop.

    You're problem is probably with the points or a wiring problem.  If the points aren't opening, they can never park, or even turn off, for that matter, without the use of a separate switch to kill the power to the "constant power".

    I had this exact same problem with my son's '65, and was able to shim the cam on the points, to get it working correctly, and never had another problem with his wipers the rest of the time we owned the car.


    Edited by picon3 - 04-May-2011 at 2:04PM
    1972 GTS 351CJ-4V black/black
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 04-May-2011 at 9:38AM
    I had thought the wiper motors were the same 72-79?
    Paul
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2011 at 6:25PM
    I have pulled motor off multiple cars, and they all are the same to me.Advanced had the "standard motor" and I got into a debate with the guy at the counter. Perhaps I am not 100% correct, but I sware after working on these cars for nearly 20 years...since I was 13 or so...the standard they had was something I have NEVER seen.
    I ran the motor again tonight. Park works now.
    It hits a few spots where it just stops dead. Thinking it is in fact the contact block that is the issue.
    Probably what happened last year on powertour when the damn things would not shut off.

    I also had not fully seated the motor down, and 2 bolts were loose.
    Tightened it down, and no issues now.

    Andrew
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 14-October-2011 at 3:30PM
    Had Old Lazarus out tonight and wouldn't you know it, but the wiper motor wouldn't park.  It's never done this before.  I have the motor off of the 73 (see below) I demoed the car a couple of years ago.  Should I just replace the motor or try to trouble shoot it the one that's already installed?  Ideas? 
    And I just detailed the motor.  Ugh!  Maybe it was the gunmetal paint instead of white?  LOL Paul~


    Edited by picon3 - 14-October-2011 at 3:35PM
    1972 GTS 351CJ-4V black/black
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 14-October-2011 at 3:56PM
    Clean the ground straps.. You may have painted over them. 
    Paul
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote ilyes Quote  Post ReplyReply Direct Link To This Post Posted: 14-October-2011 at 5:09PM
    mine was working fine before, when i pulled the engine, i removed the motor to paint the fire wall, after that, no way to get the park function to work again
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote mcford Quote  Post ReplyReply Direct Link To This Post Posted: 14-October-2011 at 5:27PM
    Originally posted by Psquare75 Psquare75 wrote:

    Check the ground strap between the plastic cover, motor, and case. They usually corrode, and the wipers will not park. 

    +1.  I have had this issue before too and the wiper motor ground was the issue.
    Mike
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 15-October-2011 at 2:00PM
    Just to be sure, this is the ground strap we're talking about right?  It's a copper strip that has an accordian like shape that runs from underneath the plastic cover back to the bolt hole that is one of the mounts to the body.  Paul~
     
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote 75GranMan Quote  Post ReplyReply Direct Link To This Post Posted: 15-October-2011 at 2:20PM
    Paul,yes that would be the ground strap.John
    John 75Gran Torino 4spd
    Tighten it down until it snaps and then back it off a half turn!
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote crispy23c Quote  Post ReplyReply Direct Link To This Post Posted: 18-October-2011 at 4:21AM
    Andy, through Auto Zone, cardone offers (2) different wiper motors for the Torino.  1 concealed and the other not.  See link:

    Hope this helps

    Chris
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 18-October-2011 at 12:51PM
    Well, I'm ready to throw in the towel and install one of the other motors that I have.  I cleaned everything related to the ground strap and it still won't park.  Very odd how it just all of a sudden stopped.  I'll test drive the other two to make sure one of them works before I swap it out.  Thanks to all.  Paul~
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote ilyes Quote  Post ReplyReply Direct Link To This Post Posted: 18-October-2011 at 1:21PM
    on mine, even after cleaning, it wasn't parking, i had to push the wipers down
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote Eliteman76 Quote  Post ReplyReply Direct Link To This Post Posted: 19-October-2011 at 4:10PM
    Paul-
    This is what I ended up doing.

    After dissection, the contact block looked to have a bad contact on mine.
    On powertour, I pretty much could not shut the damn things off in 2010, and then I unplugged them in Tennessee and then the thing died last september on a run to a car show here in Nebraska.

    I swapped out and cleaned all connections.
    Working good since then.

    Andrew
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2011 at 9:26AM
    Problem solved.  I took the extra unit I had, cleaned it, detailed and installed it and sure enough the park works.  It was a good bit of time, but worth it.  Here's some photos.  Paul~
     
    Here's the finished product.  Everything super clean in the contact area/ground strap.  Didn't do such a good job with the stamps.  Harder than they look to apply, but they're on there. 
    Here's the wiper motor dissassembled, regreased with "red and tacky" and down to bare metal after wire wheeling/dremel tool. 
    This piece is plastic.  I scuffed/cleaned before priming/painting.  Made sure to cover all the contact areas so as not to get paint on them. 
    Here it is after painting (unfortunately, you can see where the paint rubbed off when attaching the metal ring.  ...sigh.  It had a stamp of "C1" on it which I reproduced. 
    This is either ceramic or plastic; I think it's ceramic.  Ended up cleaning it with a dremel tool and a small brush before using duplicolor performance white acrylic enamel on it. 


    Edited by picon3 - 25-October-2011 at 9:30AM
    1972 GTS 351CJ-4V black/black
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote ilyes Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2011 at 9:35AM
    good job, why is that the date don't match?
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote picon3 Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2011 at 9:58AM
    Originally posted by ilyes ilyes wrote:

    good job, why is that the date don't match?
    The build date on my car was June 19, 1972 so everything was date stamped 4-6 weeks before build date.  If you look closely, I used different date codes on each part as would be expected as they were built at different times.  P~
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    Post Options Post Options   Thanks (0) Thanks(0)   Quote crispy23c Quote  Post ReplyReply Direct Link To This Post Posted: 25-October-2011 at 11:55AM

    Paul, you are a clever man!  And, how did you reproduce the stamp?  What other secrets can we unearth through conversations with you? Wink  Do tell...
    ~Chris
    Chris P. '73 GTS FastBack 351CJ-4V Triple black


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