I am trying to replace a GFCI and a switch that share the same box, the old one had line and load opposite of the new and and I have now gotten lost.

I have 4 black wires 2 white and 1 ground, hot wire has the green tape and tested no other hot wires and I have paired off the other black and white wires with electrical tape.

I have the live wire connected to the common on the switch, no idea what to connect to what from here! Please help.

The breaker is off.

HD pic https://photos.app.goo.gl/ryuuHutR5pc6QekX6

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  • 1
    Was the old switch a 3-way? Is this conduit wiring? Did you put the black tape on the white, or was it there? May 29, 2020 at 20:27
  • 1
    The old one was three way, I put the tape on the white wire, I am not sure if it is conduit wiring May 29, 2020 at 20:36
  • Good answers. We're going to need a much higher resolution close-up picture of what's going on in the back of the junction box. I tried to enhance it in photoshop but there just wasn't enough resolution or contrast there to be usable. May 29, 2020 at 22:08
  • Link to high quality image photos.app.goo.gl/ryuuHutR5pc6QekX6 May 29, 2020 at 22:25
  • 1
    I am sorry the old one was a 2 way switch yet I purchased a three way, I am switching back to the 2 way just to eliminate the variable. May 30, 2020 at 14:19

1 Answer 1


OK. So the zoom-in and brightening makes clear what is happening. Imagine there is a physical partition between left and right sides of the box.

On the left side

Goes the GFCI. Since you don't care about protecting any devices downline of here, this is super easy: Leave the "For Wizards Only" warning tape on the LOAD terminals, and everything goes to LINE. Almost all GFCI devices allow you to screw-to-clamp 2 wires under each screw.

On the right side

This is a simple 1-way (as the Brits call it) switch. 2 black wires and you're done.

You're welcome to use a 3-way switch, just make sure you put one of the wires on "common" (the black screw).

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