Window Motor Issue
I went to www.rockauto.com and bought a window motor AND regulator for about $70. A friend of mine who had experience with these did all the work for me. Took about 2 hours, noticed the new window motor/regulator goes up and down MUCH faster.
My 2 cents, check the regulator too, that might be your problem.
Before you give up, double check the connector with an inspection mirror and by feel. The stock connector is really difficult to get on the motors and it may have come loose.
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I Had the Same Prob. I got 2 Dorman OE Solutions 742-150 Window Lift Motors from Amazon for $20.79 Ea. LOL I Thout I had goten a good deal too...
I tested before reinstaling & thay wuldent lift the reg buy its self just downe!
This is a link to a post that tels how to fix/mod the Lift Motors (if y cant get your $$ back) & to remove just the Motor by driling holes in the door.
https://ls1tech.com/forums/stereo-el...tors-pics.html
My replie is on page 2 with more info on what to remove, to get it out with out having it @ the 1/2 way point if you dont want to drill your doors. mine was stuk closed may be ezer in the downe pos, but not shure :/ also the bolts that came with the cheep 1 wer to smal leting the gear skip
& had to play with it a lit to get a good contact. the 1 i got from auto zone came with the right sise bolts & thear was no prb with the gear skiping. when you have it out plug it back in & try geting it to the 1/2 way point by helping it & zip tie the regulator before removing the Motor. (thers a pic in my post) mine was 100% ded so i used some long zip ties to hold the reg from releasing the spring, removed the motor, then pressed it to the 1/2 point & had my GF add some more zip ties well i held it 
Good Luck! George #4
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