Mar 21, 2017 · The coil terminals of the relay are connected to the supply with a push switch. The Switch S1 and S2 control the relay 1 and relay 2 respectively. In the circuit diagram shown, the switch S1 is ON and switch S2 is OFF. So, the motor terminals will have a positive polarity on the left side and a negative polarity at the right side. May 21, 2011 · To close it you press the other side of the button to reverse polarity and cause the motor to move in the opposite direction. A toggle switch like in our trucks is either constant on or constant off so there would be no way to reverse the motor to close the valve, the toggle will open it but not close it.