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Remove the door card inside refit the switch to check for power to the regulator .if no power check for beak in the wiring loom at were it meats at the door frame.
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You probably need a new window regulator . You would need to take door panel off to replace it . How To Replace The Window Regulator On 2004 Ford F150 I don't know what kind of vehicle you have but this will give you a idea what's involved !
First check the fuses for both electric windows if they are good.The fuse box one is on the engine compartment driver side look for long retangular black box and open the fuse cover the cover should designate what the fuses and relay is for the other is on the driver side under the dashboard just above your left foot look under you should see another fuse box.If both fuses are good,then your going to have to check the window regulator which is inside each door.Open the door panel and check window regulator morethan likely the regulator assembly need to be change.You might just need the motor.The whole assembly is quite expensive.
remove the door trim and apply direct battery voltage and ground to the regulator motor. there will be two contacts at the motor connector. reversing positive and negative changes rotation of the motor, raising or lowering the window. If the window rolls back up replace the switch if the window does not go up replace the regulator/motor assembly.
regulator usually wears out and breaks or gets bound and burns up motor, change them both if available. Good sign of bad regulator is sloppy window in track, or window off track. I always replace them together if they are available. it is possible that you just need a switch, but most likely the reg/motor.
1. check fuses
2. if motors are good, more likely it is, it will be the windows regulator or windows switch, both tend to wear out the contacts over times. the windows switch pretty expensive, its run about 123.00 buck each and the regulator run 59.00 each. more likely will be regulator. if it not the windows switch is good. hope that help some, both not hard to replace and not easy.
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