This is Stelian.
I'm working at an old house and I want to re-wire 2 3-way switches with 2 lights to work simultaneously.
The job is on the staircase, there is a light and a switch downstairs and a light and a switch upstairs.
The source comes in the same box with the switch number I. From the same box a 3 wire cable (ground not included) goes to the other box. From box II/switch II a 2 wire cable goes to the light II.
I know that the lights should be linked together as all the diagrams found on the internet.
I believe my issue is unique because I can't find the standard wiring diagram.
Thank you for any suggestions,