just finished the resto on my 71 cuda. iwhile testing everything out, i turn on the wipers. they worked perfectly. 20 minutes later, i turned them on to check the washer motor. and wiper motor would not park when i shut them off. i messed with the switch, turned it on/off/on/off, but they just would not park. wiggled the wires on the motor and harness, and it would not park. anyone have any suggestions? thank you