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Mike G.
Mike G., Master Electrician
Category: Electrical
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Experience:  Proven Professional 46 years Experience
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how to add a 2-way switch to an existing 3-way switch?

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how to add a 2-way switch to an existing 3-way switch?
Hi, I'm Mike and I'll be glad to assist you.There isn't a 2way switch. Please explain shat you're trying to do.
Customer: replied 3 years ago.

2 way switch meant a regular switch. the 3-way switch is in the garage because I have 2 doors and I need 2 regular switches for garge exterior lights.

OK, tell me how many wires and their colors in that box.
Customer: replied 3 years ago.

three wires, black, white, and red in addition to the ground.

Unfortunately you don't have a neutral in that box and to feed the exterior lights you'll need to originate the circuit elsewhere.
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