Wiring a 2-Way Switch - how-to-wire-it Wiring a 2-Way Switch. By wiring a 2-way switch, The circuit below shows the basic concept of electricity flow to the load. Let's assume the load you are controlling is a light. The electricity flows from the hot wire (black) through the 2-way switch (shown in off position) and then to the light and returns through the neutral wire (white). This is a completed circuit.Wire an Outlet · 3-Way Switch · Switch Terminology · 4-Way Switch · Dimmer Switch · Thermostats 2 Way Light Switch Wiring Diagram | House Electrical A 2 Way Switch Wiring Diagram with Power Feed from the Switch light : The power source comes from the fixture and then connects to the power terminal. You will see that there is a hot wire that is then spliced through a switch and that then goes to the hot terminal of the light.