It makes sense to me how to wire the switch in the new location, but what about the switch in the old location–it does not have power coming in one way and going to a light. If I replace the current switch to a 3 way, I understand I would need to connect the two 3 way switches with 14-3. I wanted to add a switch to the back of the garage where the door goes into the house (so I can turn the lights on when i enter the garage from the house). These are what our shop lights plug into. From that junction box a cable goes to the front of the garage where the switch is, another cable goes towards the back of the garage with several outlets daisy chained. In my garage, power comes into a junction box in the middle of the garage. I have stared at your diagram and can’t figure out how to make it work for my set up. All grounds are tied together and connected to each switch in the box it is in. But of course, the light itself will need that white wire (neutral) to power up. You connect all white wires together in each box. The black and red wires in that 14/3 wire would connect to the other two screws. And on the other switch, you would connect the black wire coming from the light to that black screw. On the power coming in from the panel, you would connect that black wire to the one black screw. However on each 3-way switch, you have a black screw, this is the special one. So basically, you just need to add those wires to those screws and both switches. But wait, your 3-way switch has two extra screws. You just need to overcome all those extra wires. When most DIYer’s think of installing a 3 way their brain starts to melt. They are not the same as a regular switch at all. Before you begin anything with a three-way, you must understand that in order for you to have a three-way circuit you must have three-way switches.
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