I want to hook 3 switches to control one light. Here is the current wireing that I have: I have 12-2 from breaker box to the first(A) switch(3 way switch). 12-3 runs from that switch(A) to switch (B)(3 way switch). From (B) 12-3 runs to the light(L) then to switch(C)(three way switch). What do I need to change to make this work? And which color wires go where on the switchs and lights? A diagram would be lot of help. Thanks