How can i make a two way light switch into a threeway light switch without changing the wiring?

Question

how can i make a two way light switch into a threeway light switch without changing the wiring?

Answer 1

You can't.

The three way switch requires different wiring or a 3 wire

run to the other switch

Answer 2

your question doesn't make sense are you trying to add another switch to a light fixture on another wall or are you trying to change the switch itself with another one

Answer 3

the only to do this without rewiring is to buy a wireless switch (Heath/Zenith mo #SL-6133)I bought at H.D.

Answer 4

To control a light from 2 locations require 2 three way switches and to control a light from 3 locations require 2 three way switches and a 4 way switch.

Knowing this now maybe you can rephrase your question so that we can understand what it is you want to do.