Found small linkeage rod in bottom center of tailgate, wondering if the latch sensor effects window motor, have run direct power to motor... motor seemsto push for half second then stops.... is motor

SOURCE: replace motor on tailgate window on a 1987 ford bronco

You will likely have to remove the panel from the inside with the window up. Once you have the panel off I would try to have some one hold down on the switch while you tap the motor with a hammer. Of course make sure the latches are all the way closed as if the door is not closed all the way the window will not roll down as it has safety switches to keep this from happening.

If you still can not get it down then you will need to unbolt the regulator and let it down that way.

SOURCE: rear window of 92 Ford Bronco wont go up or down (power windows)

You need to either replace the motor or get a rebuild kit for the head unit. You remove the motor and take out 2 bolts in the head, use a flat blade screwdriver and hammer the pinched areas to get access to the inside gear. its a nylon gear and has 3 nylon runners inside. yours will prob be in pieces that are mixed with thick grease. best to clean all that out. the rebuild kit is pretty cheap or you can just cut a bolt into 3 similar sizes and drop them in the slots. (just remember the slip action the nylon is a safety feature in case you get your head or arm caught in the window as it closes) the metal pieces make it stronger and more dangerous. Put the head back together, pinch the metal tabs, put it all back on. Same solution will work on the door windows as well.

SOURCE: Have a 1992 Ford Bronco Eddie Bauer Tailgate window motor problem

I looked at my schematics, and they don't show a relay. They do, however, show two ground wires coming out of the tailgate window switch. There is a ground wire for the "up" side of the switch, and a ground wire for the "down"side. These would be color-coded black, and I think that it is worth checking to make sure you don't have a corroded /broken ground running from the tailgate switch. If only one grounding wire was broken, the window would operate in only one direction. Both dash and tailgate switches share the same wiring circuit, and these wires are "hot" all the time. It's normal when you get both sides of the motor leads at 12VDC when neither switch is activated. These switches function by switching off one of the two motor leads, and connecting it to ground, thus allowing power to flow thru the motor windings. Of course, reversing the polarity on a DC motor will change the direction of rotation, so changing which black lead is switched to ground gives the up or down direction to the motor.. since you can read schematics, you might check out ebay for a used Haynes manual cheap. hope this helps