Regal V6-231 3.8L Turbo VIN 8 4-bbl (1983)
the switch through terminal 3, and the motor runs at low speed. Placing wiper switch in high, or medium position on Cadillac, grounds relay terminal 1,
but terminal 3 remains open. Shunt field current flows to ground through a 20 ohm resistor connected between terminals 1 and 3, and the motor runs at a
higher speed due to the weakened shunt field. Medium speed on Cadillac models results from a 13 ohm resistor in the wiper switch, wired parallel with
the gear box relay resistor, which produces approximately 8 ohms resistance in the shunt field circuit.
Placing wiper switch in off position opens the circuit to the gear box relay magnet switch. This allows a spring loaded arm to move into the path of the
output gear drive pawl, Fig. 6, while relay contacts remain closed. The shunt field is grounded through the wiper switch and the motor operates at low
speed, allowing the gear mechanism to park the wipers and stop the motor. As the output gear rotates, the drive pawl engages the latch arm on the gear
box relay, and the output gear is unlocked from the drive pawl, lock pawl and drive plate. Since the output shaft and gear shaft are off center, continuing
rotation causes a cam action which moves the drive pawl into a slot in the gear box relay and allows wipers to move below their lowest point of normal
travel. The drive pawl pushes the latch arm against the gear box relay contacts, opening the contacts and stopping the motor in park position, Fig. 7.
