Edit: so after analyzing more up on 3 manner switches i may think i understand how they at first stressed it though, i just haven't seen any diagrams carried out this way. It seems like they passed the two visitor lines through the first mild after which to the second transfer then the energy could be coming from the second switch to the alternative lights. Now not positive if this is correct however maybe someone can shed some light on it as i have never seen it performed like this. In case you wire it like this and it would not paintings, then there is probably some thing wrong with the three-wire cable, disconnect the whole thing from the 3-wire and take a look at all the wires for continuity. Ensure all the twine-nut connections are tight - that is wherein i have the most trouble in my residence. What i've is a mild transfer on the top of the stairs that has energy coming into it. From that switch it then has a 3 wire strolling as much as a mild above the switch, which has in no way labored given that i bought the residence.
From that mild at the pinnacle of the stairs there are wires one 2-twine and one three-twine jogging all the way down to the lowest of the stairs which might be each simply sitting in a junction box.