Herein we will see the low speed windshield and washer wiring diagram for the 1956 Chevrolet. In low speed, the relay control circuit grounds through the dash control to close the motor switch. the shunt field also grounds through the dash control, providing equalized current flow through the shunt and series windings. Components shown here are: power supply from the battery, switch, relay, shunt field, series field, dash control, etc. Click on image to view it larger in a new tab.