Parasitic Draining From Power Windows Circuit.

what kind of amperage draw do u have from the batteries, not volts amps disconnect the breakers to verify that the draw is coming from the window, if verified remove connector from motor and check if not remove switch connection proccess of elimination.

 

Respectfully, if you're telling us that a circuit is drawing volts (circuits don't draw volts), then that tells me that you'd be best served to just pay a professional to diagnose this particular issue.

 

First is the alternator warm after the truck has been parked for hours.
If not disconnect all the negative battery cables. Connect a test light between between a cable and a battery. The light must use a filament bulb, something that draws a bit of current. Even a tail light but no LED's. Pull the fuses, circuit breakers and relays one at a time. When the light goes out you have found the circuit to chase.

Many of the new electronic devices use a small amount of current in order maintain memory and such. Those can trip you up.
Saw one once that if power was disconnected from the batteries the draw stopped. Had to have the test light connected between one of the other battery post and cables before the last one was disconnected. Then the light came on and circuit was found as explained.

 

If the batteries are being depleted in a short amount of time, then he either has bad batteries, a weak alternator, or a very, very high current draw.

He could also have severe corrosion at the battery terminals causing a high resistance that's not allowing the batteries to charge properly.

OP is not qualified to diagnose this issue without assistance from a hands-on technician.