Micheal,
Scroll up a bit and look at the diagram. Look at "#2 park" on the dash board switch. Follow the wire to the motor plunger switch. The plunger switch is drawn compressed by the cam. It's lower contacts are drawn supplying a path to ground.
Go back to the "2 Park" terminal on the dash board switch. Follow it in the other direction. You will note it leads to the "slow" winding in the wiper motor. Keep following in that direction and it will also lead you to ground........ both sides of that winding are grounded when the wipers are parked.
That is the ground circuit that makes the motor come to a screaching hault. (you can hear it actually "screach" to a hault.) If that winding does not get grounded in that way, the wipers will just come to a stop when they run out of momentum, or even skip over the cam for another cycle.
Steve
