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To add the switch, you’ll use one of two wiring a light switch diagrams, depending on whether the power comes to your light switch first (the most common situation) or to the light fixture first. Either way, complete these five steps for 3 way light switch wiring Turn off the correct circuit at your electrical panel. Light is controlled by two three-way switches with the light between the switches and the power first going through a switch, then to the light, and onto the second three-way switch. The ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box. 3 Way Switch Wiring Diagrams Electrical Question Could you please provide diagrams for Multiple lights between 2 3-way switches. Multiple lights between 2 3-way switches, with additional lights beyond the second switch. In both cases, the power originates at the first switch. Thanks. 1) anyone with some help, schematic diagram for 2lights (in parallel) controlled by 2 ( 3 way switch) power avialable at second light fixture. 2) same thing.. only power available at second switch.. thanx. Doughuntinc • 7 years ago. why do I have a 50 amp bleed through. Popeye Dole • 7 years ago. Wiring Diagram 3 Way Switch with Light at the End In this diagram, the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between SW1 and SW2 are connected to the traveler terminals. Regardless of what 3-way switch wiring diagram, you’re following, you’ll need to use a 3-wire cable to connect the two 3-way light switches. So what you should see if you have correct 3-wire electrical cable (Romex) is a black (power) white (neutral) and now a 3rd (Red) wire. In other words, a 3 way switch is made up of one light that’s controlled by two separate switches. The most important rationale is that there are several ways that a three way switch can be wired. Wiring a 3 way switch isn’t that difficult. The answer to how it works, is to have an extra hot wire that runs between the two switch boxes. All three-way switch and 2-way switch wiring diagrams have the same basic components Wires consisting of a LINE, a LOAD, a neutral, a pair of travelers, and two 3-way switches. If you are trying to troubleshoot a 3-way switch operation, then you will need to identify the function of each wire. Wiring a 3 Way Switch with Multiple Lights In this circuit, two light fixtures are shown but more can be added by duplicating the wiring arrangement between the fixtures for each additional light. Here the source is at the first switch, SW1, and 3-wire cable runs from there to the first light, L1.