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Old February 22nd, 2010, 17:46   #2
Windex
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Join Date: Apr 2006
Location: Cambridge
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wiper motor

There is a brass contact ring internal to the motor that can get gummed up with brass filings. there is a gap in the ring where the wipers park. When the filings fill the gap partially, the inertial of the motor and arms will carry the motor over to another revolution, and again, and again etc.

You can either take the motor apart and clean the contact ring gap or replace the motor.
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