Question about 1983 Mercury Grand Marquis

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2006 Mercury Marquis: Wipers will not turn off. Is a problem with the wiper switch? If not, what could be causing this?

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You may be under warranty and it is always beneficial to check with the dealer about Service bulletins. Those bulletins can go beyond the normal warranty.

Your wiper switch could be the problem. There is also a cutoff device inside the wiper motor. When power is applied to the wiper motor it rotates. When you turn off the power the wiper continues to rotate a partial cycle and then breaks the grounding contact. The grounding contact is no longer getting magnetism from the current and it releases the points that ground the wiper. Thats when it shuts off.

If the wiper motor is grounding somewhere else in the case it will not shut off despite the wiper switch. Some housings have a plastic shield cover that sometimes lets you spray WD 40 into the points. If this solves the problem it is not the switch but the motor.

Posted on Nov 12, 2009

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I had the same problem. The problem is in the switch (wiper, turn signal, hi-beam, hazard switch - multi-function switch). The part number is S14349 from BWD. My wipers wouldn't turn off and sometimes headlights wouldn't turn on unless I held the hi-beam switch back for about 5 seconds. After I changed the multi-function switch, the wipers still came on twice, but have been fine since (about a month). I don't know if it helped, but after I changed the switch, I pulled the top cover off the wiper motor housing (under hood against firewall right in front of driver - you have to remove hood weather stripping on top of firewall), checked the electrical connection to motor and also pulled up on ground strap checking the make sure I had good contact with the grounding strap. After I checked all that, the wipers came on once by themselves but I could actually turn them off and they have been fine since (don't know if there was some type of memory that caused the wipers to come on after I changed the switch, but they have been fine since then). Hope this is helpful.

Nov 15, 2008 | 2004 Mercury Grand Marquis

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