The 2-speed wipers on a car I recently bought don't work. I checked the fuse and it was good. I tried swapping the dash switch with another that I know is good and they still don't turn on. All of the wiring looks good. So I would like to try bypassing the switch and test the motor (while it is still mounted on the car). Which leads on the motor would I need to hot wire from the battery to see if the motor works? Also, is it possible the ballast resistor mounted to the motor could be bad?