ANSWERS: 2
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what i could only assume is that youre mechanic friend ran a hot wire to the wiper motor
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That is a very common failure on those trucks. If you go to a dealership you might even find out is is extended warrenty item and they will fix it for free. The problem is with solder connections on the circuit board in the wiper assembly. If you take the black cover off of the housing that is under hood tou can remove the board and re-solder all the connections on the board.
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