sounds like the motor, yeah the contacts in them get burnt up. sometimes you can bang on it and it'll work, but eventually it's gonna take a total dump, you can get reman motors aka pep girls or another parts store, o'reily's has decent quality aftermarket shit, anything beats autozone's parts. the only other possibility is your window switch but eh it's probably the motor. always good to have a power probe ( the mac daddy of all test lights ) to test