Question about 1983 Mercury Grand Marquis
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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Posted on Jan 02, 2017
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