Power Seat on 2005 Chevrolet Silverado 1500

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the driver side power seat on my truck has a problem.... one side of the rail system will slide but the other side will not.... fuses have been checked and they are good... do i need to replace the rail system or is there a motor that just needs to be replaced?
(1) Answer
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Sounds like only one gear set is working, so only one side of the seat is moving. What I do, is I take out the whole seat and put it on the ground, upside down, then I use a battery to move the seat and look at what is binding or not working. It is pain, but I fix a lot of seats, 'really right' the first time.
i have found out its the one motor that isnt working any ideas on where i can find another to get replaced?