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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

Wiper switch, delay module or wiper motor?

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Old Sep 28, 2020 | 02:13 PM
  #1  
Mikulh's Avatar
Mikulh
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Wiper switch, delay module or wiper motor?

On my '91 F150, the wipers work fine on delay and on low, but when I put them on high they work fine for a while and then just stop mid-stroke on the windshield. When this happens I can turn the switch off and back on and they'll start working again. I usually just run them on low or delay to avoid this, but I would like to fix the problem since sometimes I need to run them on high.

The problem is that I'm unsure whether the problem is in the switch, the delay module, or the wiper motor.
Does anyone have any thoughts on how to troubleshoot this?
 
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Old Sep 28, 2020 | 02:35 PM
  #2  
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Put Rain-X on your windshield and you will never use high again.
 
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Old Sep 28, 2020 | 04:21 PM
  #3  
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Originally Posted by Mikulh
On my '91 F150, the wipers work fine on delay and on low, but when I put them on high they work fine for a while and then just stop mid-stroke on the windshield. When this happens I can turn the switch off and back on and they'll start working again. I usually just run them on low or delay to avoid this, but I would like to fix the problem since sometimes I need to run them on high.

The problem is that I'm unsure whether the problem is in the switch, the delay module, or the wiper motor.
Does anyone have any thoughts on how to troubleshoot this?
I found a writeup on this form, the detailed removing the front cover on the wiper motor and cleaning the contacts. That worked for me. But, be very careful, they are delicate. Try a search on here for that.
 
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