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Thread: Jury-rigging wipers motor in '90 Country Squire

  1. #1
    Can't go to hell, if I am already there. bnw's Avatar
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    Default Jury-rigging wipers motor in '90 Country Squire

    So, the situation is like this: My CV is ready to drive, but the wipers are dead. I switch them on on the lever, but nothing happens (sometimes I hear a relay, but that's all). Washers work ok at the same time, so I guess the circuit breaker must also be ok. Looks like the motor itself is ok, too, as the garage swapped the one from Colony Park, and nothing changed. I presume there is a more severe problem with the wiring, eg. the lever itself is damaged, or the cable bus is broken somewhere. As I need to use the car quite soon, I was thinking of jury-rigging it - putting an external signal line, with a switch, to feed the motor with necessary input. I know that the motor has a 4-pin connector, one goes for ground, one is +12V, and I presume the two others are high and low speed. Can I simply run another +12V with a switch to one of these pins? Am I going to loose anything else than wipers parking in designated position?

  2. #2

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    I drove a while with a squeegee In my left hand.
    When I saw a cop, I prayed.
    Either the wiper motor or the wiper switch its bad.
    In my case after replacing the wiper motor, it was the switch in the turn signal lever.
    I know the feeling well.

  3. #3
    I'm an air-conditioned gypsy gadget73's Avatar
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    I believe these are ground-side switched, not hot side. Check the EVTM to confirm, but it does have constant supply to make the parking stuff work. Pretty sure you should be able to ground the hi or lo wire and make it run. If that happens, it has to be a switch problem.

    if the hot to the motor isn't good nothing works, if the ground isn't good the park doesn't work.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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    Can't go to hell, if I am already there. bnw's Avatar
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    Hmm, I assumed they are hot ones, as three lines are covered with a red plastic in the connector, including the +12V. Certainly +12 is ok, so is the "main" ground. Do I get it correctly I should simply wire one of the signal outputs to the main ground to have it working? If so, why the hell did someone install a red plastic cape on those signal lines O_O

    Thanks for the ideas!

  5. #5
    I'm an air-conditioned gypsy gadget73's Avatar
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    Don't make any assumptions and I may be wrong. I'm not looking at the wiring diagram.

    Also Ford colors don't always mean anything. The power feeds to the JBL amplifier option are red and yellow. Red is the ground, yellow is positive.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  6. #6

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    Ahhh the memory now kicks in.
    It was the wiper control module under the dash.

  7. #7
    I'm an air-conditioned gypsy gadget73's Avatar
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    yeah the switch does go through that. The control module is what does the intermittent function but if thats dead it won't pass anything through to the wiper motor itself. There is a relay on it to pulse the thing on and off, so thats probably what you hear clicking.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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    Donating Member massacre's Avatar
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    Quote Originally Posted by stinkydogfilms View Post
    Ahhh the memory now kicks in.
    It was the wiper control module under the dash.
    Happened to me in my exploder. Module had cracked solder joints
    ..

  9. #9

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    Sorry to hijack, but my 88 Crown Vic wipers are slow even at the highest setting. Barely enough in a storm. The intermitent settings etc. still works (trying to say I can slow down further by turning the nob, etc.). So what should I check? Is that usually a sign of a weak wiper motor?

  10. #10
    I'm an air-conditioned gypsy gadget73's Avatar
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    or the linkage is crusty and sticky. Might be worth pulling the motor and then moving the linkage by hand to see how stuck it is. Some oil dribbled into the various joints may free it up if it doesn't move well.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  11. #11
    Can't go to hell, if I am already there. bnw's Avatar
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    Ok, did a McGyver thing on the wipers. As the motor was working well when plugged directly to +12V, I simply unplugged the 4-pin connector, disconnected the horn, and used the +12v for horns to provide power for the wipers. Now, when pressing the horn, I get working wipers. Enough to drive back from the shop.

  12. #12
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    LOL, nice.
    So, it sounds like the Multi-Function Switch is likely the issue?
    On a '90 MGM/CV, and I'm pretty sure LTC also, you can for sure use the MFS from up to '94. Rockauto lists different part numbers for '90-'91 and '94 but I have a '94 MFS I put in one of my '91s. '95+ might work as well, but I don't have first hand experience to say for sure.

    Knowing that you can use up to '94 (for sure, possibly later) could be useful for you since it may be harder for you to get parts on your side of the world, and gives you more options when it comes to price.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, backup/summer cruiser
    ~ 1997 GMC Yukon SLT - wannabe winter DD - many issues, returning sometime in the 2020s
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  13. #13
    Can't go to hell, if I am already there. bnw's Avatar
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    Not sure which particular part is the root of the problem atm. I guess unplugging the switch, and trying to connect certain pins/ plugging the switch into an external source of power and checking the inputs could give me an answer. But that requires a bit more time than I have atm :/

    Thanks for the protip of using the aero switch. There's a guy who has a donor car some ~300km from me, he might have a couple of parts.

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