I'm close to having the last few gremlins worked out in the F-250. The first issue that I solved today was intermittent problems with the front passenger power window. Sometimes the window will go down but won't go up which isn't an ideal situation at any time, but in the winter it's a real problem. In my haste and laziness I did a search online for the most likely cause and a common theme was a failure of the multi-function switch on the driver's side. Power goes through the switch to the other three doors so it seemed like a plausible explanation and an easy fix.
I ordered a new (better) switch from RockAuto for a little under $87 which showed up yesterday. I installed it this morning and the passenger window appeared to work, until it didn't. After a few down/up cycles it stopped working. Then I figured that I should actually do some troubleshooting!
I have three factory service manuals including a book of electrical circuits for the truck and quickly determined that the front passenger switch was getting power at the appropriate time. I then used a 12V power tool battery to power the window motor at the switch and it worked up and down repeatedly without issue but the voltage was around 13.5V from the battery. I figured it must be a defective window switch on the front passenger door so I removed one of the rear passenger window switches which is identical and tried it up front and the window worked as it should, until it stopped working after a few up/down cycles. WTH!
I removed the door panels, front speaker and plastic protective film and looked at the window motor. I removed the connector at the motor (both of them) and cleaned them. Then I sprayed white lithium grease on the tracks of the window regulator where the guides slide and used the power tool battery again to lower and raise the window a few times. I noticed that it moved a lot easier, a lot faster and it was smoother. After reinstalling the door panels and window switch and powering the window down and up many times I'm convinced that the problem was friction in the regulator and not a bad multi-function switch or a bad window switch or a failing window motor. Time will tell if the problem is solved, but based on multiple cycles without issue I'm guardedly optimistic.
Here's the new multi-function switch that I didn't need. Even though it was an unnecessary expense, on the upside it's a nicer switch than the one it replaced in that it has the labels on the window lock button which are not present on the one it replaced. Also, I now have a properly working spare in the form of the original switch.
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