I have a 98 Amigo 2.2 motor and the frontwiper blades do not return home when the switch is turn off. They stop where they are at. The windshield wiper switch has a momentary action a slow and a fast position. The momentary starts and stops almost right away, but the slow and fast work till you shut the switch off but the blade stop where shut off. Any way to tell if it is the Switch or motor?