New here,
Got a new to me F250 with the 460. It was my grandparents old farm truck so its pretty beat up, but Im in love with it.

Anyway she runs great. Ive been replacing sensors to get gauges working, relays and blower motor and what not. Next thing I want to fix is the wipers.

They run on the lowest speed all the time. I can turn it to higher speeds but it wont ever turn off. Its just a twist **** to the left of the wheel on the dash. Ive looked all over online but could only find fixes for newer model trucks. Any help would be appreciated! Thanks

 

Inside the wiper motor is a "park switch" . What that does is allow the wiper motor to rotate to the wiper's park position when the wiper control is turned off. That switch sometimes gets shorted out and the motor will run even with the wiper **** turned off and you will loose intermittent wipe too.

Being its a 1990 truck, best thing to do is replace the wiper motor, they do go bad but usually they quit working not keep running like yours.

If your inclined, you can take off that connector plug that has the park switch and clean/repair it.

 

Ok cool. I figured Id be replacing the motor but I didnt want to if there was a quick solution.
Theyre looking pretty pricey. Do I dare get one from a pick-n-pull? Or is this too common a problem that Id end up getting a bad one. I know my yard has a free 7 day return but multiple trips and replacements isnt something I wanna mess with either.

 

I know they are not cheap. If the pick-n-pull had a 30 day "warranty" then it might be a option, but 7 days.... I rather spend the $$$$ on a "new" one

Usually these wiper motors fail when the magnets become loose in the motor's housing and slow down then stop. I got a few from the PNP and each one failed about 3 months later. Usually in a good ole Florida thunder storm.....

I got lucky on one wiper motor when I re-glued the magnets back in place, it still running 5 years later in my 89 F250. The other three I re-glued did not work properly, had one run backwards(got magnets in backwards) the other could not pull the wipers at any speed(magnets in wrong placement) and last one had a burnt up commentator. The burnt up commentator motor had good magnet location so I was able to correctly match them to another(one in my truck now) to work.