Electrical

2 gang light switch interference with adjacent room lights

Anonymous user 15/03/2024 - 2.55 PM

I have unscrewed a 2 gang light switch during repainting of my living room. I noticed that one of the black wires had come off and I put it back to where I thought it should be (L2, right switch on the diagram). The lights are now working, however, one of the switches is now interfering with the light in the adjacent room that will not turn on when one of the switches is on. I examined the wiring more carefully and used a tester to check which ones are live. I found only one live (red) cable that was connected to both COM ports. The second red was connected to the L1 port and is not live. I am obviously missing something here, but I can't figure it out. A sketch of the switch wiring can be found here: https://drive.google.com/file/d/1mh6vrYMYIu27GVLVawMl_QXued3-j0RZ/view?usp=sharing Update: 27 April 2020. Thank you all for your answers. I tried swapping to the next L2 or swapping L1s without result. This is not a 2 way switch. it is a 2-gang switch with two separate rocker switches that activate 3 and 1 bulbs respectively in my living room. I never expected that its function would interfere with the next room's light. It looks to me that someone has wired a new light using power from this switch. Update: 28 April 2020. Still no luck. I have created a video that shows the wiring and how the switch interferes with the light in the adjacent room. Once the lockdown is over, I will call an electrician to solve this puzzle! https://www.youtube.com/watch?v=ea8A9QTxA40&feature=youtu.be