i want to turn a windshiled wiper motor one revolution at the slow speed and stop it at the same place each time. With a timer I would then initiate the cycle again. This is being powered with a twelve volt supply outside of a car for a project. I‘ve read any number of descriptions of the parking circuit but can‘t figure out how to wire it for this use.
The self-parking circuit is normally open switch in series with the supply. When you start the wiper motor you are closing a switch connected across the self-parking switch, so the motor starts. Once the motor starts, a mechanical arrangement holds the parking switch closed so that the motor continues to turn if the dash or column mounted switch is opened. The motor continues to turn until the wiper arm/s return to their normally parked position, and at that point the self-parking switch is opened by the cam (or whatever operates it) and, if the dash mounted switch has been set to off, the motor stops. The motor makes many revolutions for one sweep of the wiper arm/s. If you need the motor to make only one revolution you will have to make a cam which mounts on the motor's shaft and suitably shaped so that it operates the switch after one revolution.
