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Thread: Wiper question

  1. #1
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    Default Wiper question

    86 Mustang: I put power on the SVO for the first time since I got everything installed. The windshield wipers work fine except when you turn them off they park themselves in a vertical pisition. This car has been all apart and the wiper motor assembly looks to have been apart and repainted. I suppose there are some switches or something inside the housing that are in backwards or reversed or something. Has anyone had this issue?

    Thanks
    Mark
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  2. #2
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    Does yours just park where every you shut them off? My capri does this now and I haven't figured it out yet either. I also had the motor out for paint prior, and since then I have to time it right to get them to stop at "Home".

  3. #3
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    Whenever I turn the off they park in the vertical position every time instead of horizontal. Other that that they work fine. There must be a cam or something that makes contact with the switches inside the motor housing, under that little plate on the front. I expect it won't be too hard to figure out, I just have not gotten to that particular problem yet.

    I could replace the motor/transmission assembly with a spare I have but the one in the car is all pretty and clean. I will use my spare to compare to what is installed, that should tell the tale.
    Last edited by MAPSVO; 04-20-2012 at 07:24 AM.
    Mark
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    FEP Power Member EJSVO's Avatar
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    MAPSVO:

    At first thought it sounds as if you have a simple problem.
    It may be that teh wipers were not re0installed with teh wiper motor - arm assembly in teh "Parked" position.

    Essentially a 'Clocking" issue.

    I would try removing the wiper arms from their spline drives with them in their now "vertical" Parked position as you indicate.

    I would then replace the wiper arms approximately Half way back towards the OEM Parked position- Making certain that you have fully and carefully installed then back on the spline shafts and the wiper arms are in the OEM 'Locked position on the spline drives.

    Turn on your wipers - Then turn off After they have completed a complete normal "cycle"

    If the wipers wind up back in the "Half Way position" - They you have a simple "Clocking" issue- At which point you can remove and then reinstall the wipers on the spline drives as near the OEM Parked position as the arms and splines will allow.

    I had this same situation occur on my 1988 TC after a well intended Ford tech installed replacement wiper blades - He later admitted that he had reached in the car and hit the wiper switch , with the key on , and that the motor had activated - Thus he "reinstalled " the wiper arm at a position on the spline drives that was not at the true Parked position

    See if this simple fix works

    E. J.

  5. #5
    FEP Super Member IDMooseMan's Avatar
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    If that doesn't correct the problem, it may be a transistor/capacitor issue. There should be enough stored electricity to return the arms to the "Parked" position. It sounds like you're saying when move the wiper switch to the "Off" position, the wiper arm sweep motion stops immediately.

    If that's the case, there doesn't seem to be enough stored energy to return the arms to the "Home" position, generally indicating an electrical issue.

    I have the test and adjustment procedures in my 1979 Service Manual (if that would help), but, as stated, mine is a '79 and does not have the intermittent functionality.
    Craig "IDMooseMan" Peters
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    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by Capriman86 View Post
    Does yours just park where every you shut them off? My capri does this now and I haven't figured it out yet either. I also had the motor out for paint prior, and since then I have to time it right to get them to stop at "Home".
    The motor has an internal 'park' switch that rides on a cam. This switch is closed in all motor positions except PARK. When the motor switch/cam reaches PARK the internal switch opens. The wiper switch on the column provides power directly to the motor windings when it is in the ON (LO or HI) position. When it is in the OFF position it supplies power to the motor windings thru the internal switch via a second set of contacts. The motor continues to run until the PARK postion is reach wherein the internal motor switch opens and the motor stops. Since your motor does not continue to run to the PARK position either the switch in the column is bad or the internal switch/cam in the motor is bad.

    You can verify between the column switch or the motor switch by disconnecting the 4-contact connector from the motor and connecting a jumper wire between the RED and BLK/PNK on the harness side. With the ignition switch in the ON position and the wiper switch on the column in the OFF position check for battery voltage between the WHT wire on the harness connector and chassis ground. If OK then the internal switch in the motor is failed/failing. In no voltage then the wiper switch on the column is failed.

    This is for non-interval wipers.
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  7. #7
    FEP Super Member IDMooseMan's Avatar
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    That's some good info.
    Craig "IDMooseMan" Peters
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    Yes it is good info.

    As far as "clocking" it seems if I move the arms on the shafts then they will try to be driven down into the cowl below the bottom of the windshield. Maybe I am wrong about that I will give it a think. The wipers haave the proper sweep now, they just park in vertical.

    As far as "stored electricity" I don't think thats it, because when I turn them off they continue to travel to the vertical position and then stop.

    I figure the cam/switch theory is where I will wind up finding the problem.

    I bet when the PO had the motor/tranny apart it was reassembled in a incorrect manor.

    You guys have offered up some very good thoughts/ideas and I will let you know wjhat it turns out to be.

    thanks
    Mark
    Mark
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  9. #9
    FEP Super Member IDMooseMan's Avatar
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    "...when I turn them off they continue to travel to the vertical position and then stop."

    Sounds like the reassembly was done incorrectly.
    Craig "IDMooseMan" Peters
    1979 Mustang Ghia Notchback, 2.3L, Holley 5200, 4-spd, 3.08:1 7.5" diff, A/C, PS, PB, AM/FM/8-Track, Sunroof, Rear Defroster
    USAF SSgt 63170 1983 - 1992; Co-Founder, Vice President, Omega Delta Sigma, ID-A 2/2015
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  10. #10
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    did you hook the linkage in the cowl up to the motor wrong? I did this on my old 68 Charger and the wipers did all sorts of crazy stuff..
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  11. #11
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    I did not have it apart, I got the car the way it is now. I am going to give that a look however.
    Mark
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  12. #12

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    If the wipers otherwise have a normal sweep, but just park wrong, it's not a problem with
    how the wiper arms are clocked on their shafts, it's a problem with how the wiper motor arm
    is clocked.

    The crank arm on the wiper motor just spins in circles, it's the position of the arm on the
    wiper motor output shaft, relative to the internal parking switch, that dictates where the
    wipers will stop.
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  13. #13

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    On my wife's 86 GT, the wipers worked fine until one day I changed my clutch cable. After that, the wipers have worked backwards. They actually go down towards the cowl and hood, then parks back in normal position. I changed the switch on the column but no change. I am thinking the motor is bad but not sure. I might try reversing the wiring to see if that works as a temporary fix.

    Any ideas?

    Is there a wiper relay or something other then the switch?

    Keith

  14. #14
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    Man that's wierd. Mine turned out to be the way the arm was installed on the motor shaft. I reversed it and they work fine now.
    Mark
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    84 GT 350 Turbo Hatch
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  15. #15
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    Quote Originally Posted by TWR2003 View Post
    The motor has an internal 'park' switch that rides on a cam. This switch is closed in all motor positions except PARK. When the motor switch/cam reaches PARK the internal switch opens. The wiper switch on the column provides power directly to the motor windings when it is in the ON (LO or HI) position. When it is in the OFF position it supplies power to the motor windings thru the internal switch via a second set of contacts. The motor continues to run until the PARK postion is reach wherein the internal motor switch opens and the motor stops. Since your motor does not continue to run to the PARK position either the switch in the column is bad or the internal switch/cam in the motor is bad.

    You can verify between the column switch or the motor switch by disconnecting the 4-contact connector from the motor and connecting a jumper wire between the RED and BLK/PNK on the harness side. With the ignition switch in the ON position and the wiper switch on the column in the OFF position check for battery voltage between the WHT wire on the harness connector and chassis ground. If OK then the internal switch in the motor is failed/failing. In no voltage then the wiper switch on the column is failed.

    This is for non-interval wipers.
    wow, 5 months for me to notice this reply LOLOL

    Mine are interval wipers, but I still haven't taken the time to even look at them yet. I don't go out in the rain much so I forget!!

  16. #16
    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by Capriman86 View Post
    wow, 5 months for me to notice this reply LOLOL

    Mine are interval wipers, but I still haven't taken the time to even look at them yet. I don't go out in the rain much so I forget!!
    I see
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  17. #17
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    I see what you just did

    Ok........I........TRY not to go out in the rain, that day did not make me happy, and lord did wipers suck, but the headlight covers made life worse lol

  18. #18
    FEP Senior Member '86 5.0L's Avatar
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    so what happened when before they worked great, and now they stop at the vertical position? I havent messed with the wipers at all and they started acting up recently
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