This one is a bit complicated but verified as I just put it in a Strat. SW3 looks a bit complex but really isn’t - it’s wired as a Phase with 3 wires attached to C2 (ground, wire to lug 3 and ground to switch). The middle pickup is connected to the middle pickup.
This is a nice setup as it provides both Phase and Series in different combinations. Once one is used to it, dialing in various tonal variations are numerous. I wish I could get B, B+M, M, M+N, N when SW3 is in the down position. If anyone can see a way to do that I would appreciate it.
Note that ( ) = Out of Phase, x = Series and + = Parallel.