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Take a closer look at a 3 way switch wiring diagram pick the diagram that is most like the scenario you are in and see if you can wire your switch this might seem intimidating but it does not have to be with these diagrams below it will take the guess work out of wiring interested in a 4 way switch wiring diagram. Now discussing 3 way light switch wiring diagram as also discussed above the color codes of the wires as having three insulated conductors as black as hot red as switch wire or called traveler and white as common wire as also shown when light is connected to both black and white wires. Congratulations on wiring a 3 way circuit in my mind wiring is one thing but to look at a diagram as the one above and understand the principle involved that is the key to do it yourself house wiring if youre simply replacing a 3 way switch the diagrams below will show the different scenarios on how your circuit could possibly be wired. 3 way dimmer switch wiring diagrams the following 3 diagrams show the wiring for a specially made dimmer that can be used in these circuits in place of either of the the 3 way switches or both this arrangement allows for lowering the lights in a 3 way circuit. 3 way switch wiring diagram line to light fixtureline voltage enters the light fixture outlet box no longer allowed after 2011 nec if no neutral wire in switch boxes 3 way switch wiring diagram light fixture between switchesline voltage enters the first 3 way switch outlet box light fixture is located between switch boxesno longer allowed after 2011 nec if no neutral wire in switch boxes