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We are replacing old outlets in our new home (built in 1969) and currently have a double gang box in the kitchen, with a double toggle switch (each switch controls one of 2 kitchen lights) and a regular outlet. We want to replace the double toggle switch with a new one (same configuration) and replace the outlet with a GFCI receptacle, but can't seem to get the wiring right to control each light separately via the two switches. Does anyone have a diagram for what we would do for this configuration?

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  • There should be a diagram of the switch inside the box it came in...if not, please post a picture of it and the box it's going in to. – JACK Dec 19 '19 at 19:10
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    Welcome. The Electrical Code and standard practice has changed a lot in 50 years, currently the light and recepts would be different circuits, but that hasn't always been code. To get a useful answer it would be best to unscrew the devices, pull them away from the junction box, and post pictures of the cables entering the box, and the switch terminations. – NoSparksPlease Dec 19 '19 at 19:14
  • And when you get a chance please take the tour stackexchange.com/tour – NoSparksPlease Dec 19 '19 at 19:18
  • Model number of the new switch? How many wires (not counting green or bare) connected to the old switch? – manassehkatz-Moving 2 Codidact Dec 19 '19 at 19:18
  • Can you post photos of the inside of the box please? – ThreePhaseEel Dec 20 '19 at 0:26
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Replacing the recep and replacing the switch are two separate transactions.

Replacing the receptacle

First, make sure this recep is not already protected by a GFCI somewhere else. Push TEST on all kitchen GFCIs and on all kitchen circuit breakers that have a TEST button. If doing any of this knocks out power to the receptqcle, your work is already done. Congrats!

Now, if you need to install the GFCI recep, leave the warning tape on the LOAD screws, don't use them. You don't know what they're for, and lights don't need it.

Note that the LINE screws are actually capable of taking 2 wires each, via the screw-and-clamp arrangement built into it.

Replacing the switch

Don't replace the switch if you don't need to. If you are only changing it from two-oval to match the rectangular Decora style used by the GFCI, you don't need to do that. You can get faceplates with ovals and one Decora.

The switch is wired one of three ways.

  • 3 wires - one hot supply wire (wired to common) and 2 lamp wires.

  • 4 wires - 2 lamp wires, and two hot supply wires - one from supply and the other carrying power onward to other points of use. These both will be connected to "common": The connecting tab will not be broken, so they connect through to each other.

  • 4 wires - separate control of each switch. In this case the "common" terminal won't be common because the connecting tab will be broken off. Each switch will have its own dedicated supply hot wire and separate lamp wire. These must be kept paired, and must not be crossed.

You will need to examine the old switch and seee how it was connected, and connect the new one the same way as approriate for it.

Quite likely, all wires will be black. I like to use colored tape to distinguish wires. This is best done before disassembling everything.

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