Constant Speed Operation

During constant speed operation, both the pulse and park relays are closed. Speed is controlled by connecting resistors between the shunt field and ground. In "LOW", the shunt field is grounded directly at the dash switch. In "MED" speed (some models) a 20 ohm resistor in the park relay and a 13 ohm resistor in the switch are connected in parallel to ground. In "HIGH", the 20 ohm resistor in the park relay connects the shunt field to ground.