I tried using another battery to power the motor directly, didn't work. I used the Y-B wire and L-W wire according to the diagram that was posted, looks like I might be doing something wrong. What's weird is that I kept playing with the window switch up front and it kept going up little by little until it completely closed. I was going to disconnect the harness from the rear motor but as soon as I lifted the tailgate, the window went back down again! If someone more knowledgeable about circuits could help me power the motor directly, I'd greatly appreciate it. I'll try my luck again and see if I can get the window to go back up, but doesn't look too good, might've wasted all my luck.