Intermittent wipers not working

1999 FORD F-250
130,000 MILES • V8 • 4WD • AUTOMATIC
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MATTY CARROLL
  • MEMBER
  • 1 POST
Wipers work sometime. Installed new wiper motor, all fuses good
Sep 27, 2010 at 6:15 PM
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TECH1FORD
  • MEMBER
  • 102 POSTS
it is the multifunction switch that controls the wiper and high beams, turn signals replace that and it will be fixed. Here is how in the diagrams below.
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Sep 29, 2010 at 2:11 AM
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MARKSMANBBS
  • MEMBER
  • 3 POSTS
I had this issue, got the switch did not change it had to get a new wiper motor as well FYI.
Jan 28, 2020 at 12:02 PM
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SHANEMN
  • MEMBER
  • 0 POST
That did not fix the problem. All the common relays and fuses are good. A new multifunction switch didn't help. Where's the 14pin wiper relay?
Mar 13, 2026 at 10:32 AM
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STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,191 POSTS
Yep, that is because the problem is the wiper control module behind the left side of the dash. You need to remove the engine cover to get at it. Check out the images (below). Let us know if you need anything else. Ken
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Mar 14, 2026 at 10:54 AM
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