Please help me troubleshoot my 3 way switch
Hello. I've racked my brain enough and need help. From my best guess, I have a three way switch with the power at the light with one of the switches at the end of the circuit. So... Light-Switch-Switch. The 12-3 wire coming from the light goes to the switch at the top of my stairs. That's right, they used 3 wire from the light to the first switch, with the red being constant hot and the black going to the 3 wire of the last switch (bottom of stairs-end of circuit). My problem is, where does the neutral of the 3 wire traveling from the light to the 1st switch splice to? They used the "white" wire from the last switch for a traveler so it's no longer a neutral.
Currently, the light only works sometimes when I attach the neutral of the 3 wire coming from the light to the neutral of the downstream neutrals. I did my best to create an illustration of the setup. Please see attached and help!