Originally Posted by Kipp
first off what year is it? take the door panel off and use a multimeter to test voltage at the motor harness to see if it's getting power when the switch is activated. if it's getting power then it the motor, if not then it's probably the switch itself. I had the switch go out on my 03 when I had it.
It's an 04. How would I know if the regulator had gone? What if I just put a test lead into the switch and active the button? Would that tell me I have power going to the switch? That would leave two possible answers either the motors packed up or the regulators not working?