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Ken

wrote:
I have a 3 way switch setpup at each landing for my basement stairs.
I replaced the three way switch at the top, and it is a combo switch.
Single pole/3 way. tWO LITE TERMINALS AND A COMMON. i WIRED THE TWO
WHITE WIRES TO THE LITETERMINALS AND THE BLACK TO COMMON. aLWAYS ON
SITUATION DEVELOPED. tRIED SWITCHING ONE WHITE FOR BLACK AND
DEVELOPED A SITUATION WHERE THE LIGHT TURNS ON AND OFFFROM THE NEW
SWITCH, NOTHING ON OTHER SWITCH. tHE OTHER SWITCH IS TWO SEPERATE
CIRCUITS, AND A SINGLE POLE/ 3WAY AS UPSTAIRS. tHE upstairs single
pole controls the outside light and works fine.
I have tried the two white and one black in all configs poss on the 3
way part of the switch. The two single pole wires are wired as
beofore.
PLEASE HELP

Try the following site, it might make it clearer how to wire the
switch. http://www.wfu.edu/~matthews/courses/p230/switches.html