My house has older wiring and a lot of stuff is rigged in a weird way. When I installed the Kasa switch, I was careful to only connect black to black and white/neutral to neutral and ground to ground (green). But i will confess to playing “wiring roulette” when I noticed that the lights came on, but would not turn off.

The old switch that was in there only has a black connection and works fine. However, it appears to use the live load connection from two different conduits in the wall.

I have no idea how to connect the Kasa so that it will use these wires and “switch”. It connects to the WiFi just fine, and as I said the lights are on but just won’t turn off .

Any help appreciated

old wiring

kasa switch

I tried the solution provided and it didn’t turn on the light at all. The old switch seems so simple, using only the black, but I don’t know what I’m doing wrong. The Kasa SmartSwitch was getting power and connected to my wifi, just didn’t control the light, on or off. I put back the old switch the way it was, and it works just fine

live wires with kasa

no current connected together

old switch

old switch black wire going back into wall

  • 1
    Did you go black to group of black, black to black, green to ground and white to the group of whites? I.E. Explain how you had it wired when it was not functioning. – Alaska Man Mar 6 at 20:10
  • Do you have a multi meter? Are all the black wires disconnected from every thing? – JACK Mar 6 at 20:33

The whites and greens are pretty straightforward.

However I believe this switch has two black wires. One of them should be identified as "Line" or "Supply".

Also, 2 black wires went to the old switch.

I want you to connect the "Line" black wire to one of the 2 black wires that went to the switch - preferably the one that is nutted to other black wires.

Cap off the other 2 black wires (1 from switch 1 from wall).

Now, see if the smart switch will power up and identify itself on the Internet. If it does, go to the next step. If it doesn't, you got the wrong black wire.

Once the switch powers up, there you are with 2 black wires capped off and unconnected. Connect them to each other and the light should now work.

  • I was hoping you would answer, because I wanted to send you a message of thanks for your answers to other questions. Your comment about “roulette” on another electrical question both had me laughing and taught me something at the same time. I will try your solution and let you know! – dq72 Mar 6 at 23:42
  • Thanks for providing this answer. It didn’t quite work. I have posted some additional images if that’s helpful at all and I thank you for helping in the first place – dq72 Mar 7 at 19:03
  • @dq72 Weird. From what I can tell from those potato photos and a bit of web searching, Kasa doesn't seem to have a distinct Line vs Load hot wire - I guess they put in the extra circuitry to let it power its own electronics from either one, so it wouldn't matter how it was installed. I have faith that you are wiring it correctly, since you are easily able to rollback to a plain switch. All that's left seems to be "faulty switch". – Harper - Reinstate Monica Mar 7 at 19:23
  • Ok thanks. I guess I can try to install the kasa at another outlet switch in the house (maybe one that is a bit simpler) and see if it works. If it doesn’t, that maybe would isolate it to a bad switch – dq72 Mar 7 at 21:44

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