There is a contact switch inside of the motor that still allows the armature to run with the switch turned off, if you turn the switch off and the wipers are still 1/2 way up on the glass.
The arms are still in motion until they are at the base of the w-shield just above the molding.
The switch is normally closed & it is wired from the motor to ground; via the ground strap; except when the wipers go horizontal it breaks contact so that the wipers do not park up high on the glass if you turn the switch off; actually your taking away the motor's ground to turn the armature.
The dash switch grounds the motor circuit and the plug-in gives the motor power (Battery + ) if the key is on.
Perhaps there is something wrong with your wiring; the flat brass ground strap on the motor casing that gos to the firewall (ground) or that internal park switch.
I might have a photo of the switch but I can't say for sure.
The "park" switch is inside of the motor casing.
You may also have the wiper motor arm (the linkage inside of the cowl) not arranged as proper. There is a keyway on the end of the drive shaft which has a bolt and/or a spring clip on it and that key-way has a flat or 2 flats on the sides for proper placement.
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Peter Serio
Owner, Precision Pontiac
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