My drivers side window is not rolling down and so I took of the door panel and looked at the regulator and the motor. The motor spins with it disconnected from the regulator but not when connected. I cleaned the regulator and made sure it moves up and down smoothly but still doesnt work. I then checked the voltage with a multimeter and saw that pin 4 is supposed to get 10 volts but is only getting 3 ½ volts. I dont know where the other 6 is going but I cant really understand the wiring diagram. Can anyone help me, could it be the main cpu thats faulty not xfering the right voltage or what. Please anyone who can explain the wiring and what I should do. Please and Thank You.

oh pin 4 is on the motor wiring harness