Question about 1999 Ford F150 Regular Cab

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1999 Ford F150 passenger side window regulator

About three months ago the window regulator on the passenger side of my F150 suddenly stopped working. I thought that the car being nine years old and 125,000 miles that it just might have died of natural causes. So I replaced it yesterday and it worked. The thing worked all day yesterday. It was used about seven or eight times. This afternoon my truck was used for the first time. Much to my surprise the window regulator was not working. I thought it was a fuse, but why would it work yesterday and not today.

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  • gerry bissi May 11, 2010

    did you replace the motor or motor/regulator assembly?

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Whn the window does not work try this, Turn on you dome light. Press and hold the window button. Does the dome light dim? If it does it is likely a physical resistance in the window track. If it doesnt then there is a break in the window circuit. Have you tested the switch. The switch could cause an intermitten concern. The wiring of a 1999 f150 the passenger side switch could cause a concern even using the drivers switch. Check both switches using the dome light trick. If you have a test light place the clamp on a ground and the tip to the TN/LB wire and the WH/YE on the driver side switch operating it in boh up and down positions. Each wire should go power in one postion but not the other. The passenger side wire colors are YE/RD and RD/YE. Good luck

Posted on Mar 15, 2009

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