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I have a light switch that I wanted to replace with a timer switch (to control outdoor lights). When I pulled the old light switch out of the wall, there were 4 wires connected to it: Two White Wires connected to the two top screws on each side, and 2 red wires connected to the two bottom screws on each side. What the? I've never seen a light switch with only red and white wires. The new timer switch as a black, red, blue and green wire.

(Also, the old switch also did not have a ground wire connected at the bottom of the switch.)

I JUST realized that the outdoor lights have 2 light switches that control them. (Second question... can I replace one of the switches with a timer switch?)

Help! (Thanks very much!)

  • Nort American wires are not color coded, except for grounds as green/bare, and neutrals as white. However a hot can be any color except those reserved for ground. – Harper Feb 5 '18 at 21:32
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    That super sounds like a 4-way switch. Are there three locations from which this light is controlled? This is something you will need to know to proceed. – Harper Feb 5 '18 at 22:16
  • Can you post photos of the insides of the boxes involved? – ThreePhaseEel Feb 6 '18 at 0:21
  • your description is not completely clear ... Two White Wires connected to the two top screws on each side means that there are 4 white wires all together – jsotola Feb 6 '18 at 0:50

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