I have a 3-speed motor that was originally purchased from Jerry in Orange City, Fl, during the car's restoration and the motor does not park. After installing the motor and all of the correct arms, the switch was activated and the wipers cycled and parked when the switch was turned off. This was repeated a total of 3 times in the garage and all was well with the wipers stopping and parking each time. About a week later, I actually used the wipers in the rain for the first time and they stopped in the middle of the windshield when turned off and did not park. When I got home, I unplugged the harness and ran the bench checks for operation and parking. The motor does not park or move at all when the park test is run. Any ideas on what is wrong? Thanks.