Expert: Ben Menard - 5/2/2010

Question
The windows on my truck won't work. It's all 4 windows not just one.  They worked perfectly the day before but today nothing and also I have a back-up light on the driver side that went out today too.  I don't they are connected but I'm wondering if it may be the fuse or master switch?
Thanks for any help.

Answer
Hello Terri,

I don't have access to the wiring diagrams for this vehicle so I can't give you much of an answer.  However, I can give you some educated guesses and some advice on how to proceed.

1.  The first thing you should do is check the owner's manual to learn where the fuses are located and verify that the power window fuse is okay.

2.  If the fuse is okay, the next component that might be at fault is the power window relay.  If you have power to the window switch you will typically hear the window relay under the middle of the dash "click" when you press any of the window buttons.  If you don't hear the "click", you could have a bad relay or you may not be getting power to the master switch.

3.  It is possible, but very improbable that the wiring connector(s)to the master switch have come loose.

4.  It is possible that the wiring leading to the master window switch is broken.  This typically occurs in the rubber "boot" near the door hinges between the driver's door and the body of the truck.  Try rolling the windows up and down with the door open.  If that doesn't work, try operating the windows while "massaging" the wires in the boot.

5.  If your F250 is a newer vehicle, the problem may reside in what is typically referred to as a "body control module."  This is a solid state electronic device used to communicate and control the various electrical components of the vehicle.

Unless your problem is just the fuse, you are going to need the services of someone who specializes in vehicle electrical repairs.  If you live in a larger metropolitan area the Yellow Pages may have separate section for "Automotive Electrical Service."  If not, talk to at least a couple of local parts houses for their recommendations on a mechanic who has a significant amount of electrical trouble shooting experience.

Hope this turns out to be something simple.

Ben ... the power window guy