With Pulse

With the wiper switch in "DELAY" (pulse), battery voltage is applied to the wiper motor at terminal "B" of connector C1 through circuit 96. Voltage also is applied to terminal "F" through circuit 94 and the pulse delay resistance in the wiper/washer switch assembly. The battery voltage at terminal "B" energizes the park switch coil, which closes its contacts. In response to the voltage at terminal "F," the solid-state timer momentarily closes contact "A," which applies battery voltage at terminal "B" to the contacts of the park switch. The wiper motor starts.

A cam operates a contact in the wiper motor cover assembly, which causes contact "A" to open when the wipers have completed their sweep. Since the park switch coil remains energized, the wipers do not park but remain just above park position until contact "A" closes again to start another sweep.

The length of delay time between sweeps is controlled by the variable-pulse delay resistor. The delay is adjustable from 0 to 25 seconds.

With the wiper switch in "LOW," battery voltage is applied at wiper motor connector C1 terminals "B" and "C", through circuits 91 and 95. The park switch coil is again energized and battery voltage is applied to the park switch contacts and the wiper motor, which runs continuously.

With the wiper switch in the "HIGH" position, battery voltage is applied directly to the wiper motor at terminal "A" without passing through the park switch contacts. Terminal "A" is connected to a separate wiper motor brush for high speed operation. Voltage also is applied through the low speed wiper motor brush to the park switch contacts and timer contact "A" to the park switch coil. The park switch coil remains energized in the "HIGH" position. The current path from the low speed brush to the park switch coil is completed through the wiper/washer switch assembly. An open in this circuit will cause the wipers to cycle in and out of park position in "HIGH" and possibly prevent low speed operation.