Lighting wiring question

[xyz123]

Hi, we have somehow ended up with an odd setup of lights in our of our rooms. I was hoping to change it to a different situation but don't want to end up messing it even more.

Room has 9 Gu10 lights and 4 switches. 6 lights are all connected to 3 out of 4 switches and the other 3 are controlled by a single switch.

One switch plate is double gang with switch 1 and 2. Switch 1 controls 6 lights and switch 2 controlling the other 3 lights. Switch 3 and 4 are single gang, separate switches in different corners of the room. At switch 1, if I "merge" both "circuits" into one, it will control all 9 lights with a single switch. Question is what will happen to switch 3 and 4, will they still only control 6 lights or will they control all 9. I think it will be 6 only and this can make a messy situation even more messy so asking before I do anything.

Thanks for reading

[netherfield]

Is there a loop wire in the two gang switch between the common terminals?

[xyz123]

netherfield said:

Is there a loop wire in the two gang switch between the common terminals?

Honestly, I have no idea now but can open up the switch and check later.

[silentbrown]

You'll have two three-way switches, and a four-way.

https://matthews.sites.wfu.edu/misc/switches/4WayA...



If the double gang switch is the right-hand one in the diagram, you can 'merge' them successfully.

[netherfield]

Intermediate switch is actually irrelevant to the problem

[silentbrown]

netherfield said:

Intermediate switch is actually irrelevant to the problem

True, but if the switch has four terminals in use, you'll know it's not at the end of chain.