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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Wipers stop working on High at random

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Old Dec 27, 2018 | 02:40 PM
  #1  
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Wipers stop working on High at random

On my '91 F150 the wipers work fine in intermittent mode and on low, but on high they sometimes work fine and sometimes just stop working.
When they stop they seem to just freeze up (i.e. they don't park... they just stop in the middle of the windshield). When this happens I can turn them off and back on low an they'll start working again.
Does anybody know if I should suspect the wiper switch, the motor, or the intermittent module? Are there any tests I can run to isolate which one is going bad?
 
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Old Dec 27, 2018 | 03:07 PM
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I would probably suspect a problem at the motor or maybe wiring. This might help.

 
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Old Dec 27, 2018 | 03:52 PM
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You can also take the cap off your Intermittent wiper switch and remove the screw. Take off the **** and clean the contacts carefully and reassemble.
 
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Old Dec 27, 2018 | 05:40 PM
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My wipers would randomly stop in low or high speed. Turn off the switch then back on and would work for a while. In my case was the wiper motor.
 
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