With Pulse

In addition to the features of a conventional (non-pulse) Wiper System (low and high speeds), the pulse-type Wiper/Washer System includes an operating mode in which the Wipers make single strokes with an adjustable time interval between strokes. The time interval is controlled by a solid state Pulse/Speed/Wash Control in the Wiper Motor Assembly. The duration of the delay interval is determined by the Delay Rheostat in the Wiper Switch.

The Wiper Motor has a built-in self-resetting circuit breaker which opens to protect the motor when the Wipers are blocked (from ice on the windshield for example). The circuit breaker will reset upon cooling.


LOW SPEED

In the LO position, the Wiper Switch supplies voltage to the GRY wire and the Pulse/Speed/Wash Control grounds the Park/Run Relay which closes its contacts, supplying voltage to the low speed brush of the Wiper Motor. The Wipers run at low speed.


HIGH SPEED

With the Wiper Switch in HI position, battery voltage is supplied from the PPL wire directly to a second armature terminal of the Wiper Motor. The Wipers run at high speed. When the Wiper Switch is turned to OFF, the Wipers complete the last sweep at low speed and return to the Park position.


PARK

When the Wiper Switch is first turned to OFF, voltage is still applied to the Wiper Motor through the contacts of the Park/Run Relay. The Wiper Motor runs at low speed. When the Wipers reach the Park position, the Park/Run Relay opens and shunts the Wiper Motor to stop it quickly. The Wiper blades remain in Park position.

MIST

When the Wiper Switch is moved to MIST and released, the Wipers make one sweep at low speed and return to Park. The circuit operation is the same as low speed.


PULSE

With the Wiper Switch in PULSE, voltage is applied to the GRY wire and the solid state Pulse/Speed/Wash Control. The Pulse/Speed/Wash Control momentarily supplies ground to the Park/Run Relay which closes its contacts, applying voltage to the Wiper Motor. When the Wipers return to Park, the Park/Run Switch opens and ground is removed from the Park/Run Relay. The Wipers remain in Park until the Pulse/Speed/Wash Control again supplies ground to the Park/Run Relay to start another sweep. The delay time between sweeps is controlled by the variable resistor and can be adjusted from 0 to 20 seconds.


WASHER

When the Washer Switch is depressed, voltage is applied to the Pulse/Speed/Wash Control. The Pulse/ Speed/Wash Control supplies battery voltage to the Washer Pump through the ORN and PNK wires. It also starts the Wiper cycle through the low speed brush of the Wiper Motor. The Washer Pump continues to run as long as the switch is held down. The Pulse/Speed/Wash Control keeps the Wipers on for approximately 6 seconds after the Washer Pump goes off. If the Washer Pump is switched on during the pulse operation, the Wipers run in low speed for 6 seconds. The Wash cycle is completed before the Wipers return to the pulse operation.