Custom wiring for 3 pickups
This is the wiring design I use for electric guitars. It works on 3 single coils or with a front single and rear humbucker by treating the humbucker as two pickups.
I play mainly lead and I love the sound of the neck pickup. With this system I have 5 different ways of using the neck pickup, as well as 2 other sounds. There are many other possible combinations, but these are the ones I would use.
The 3p4t pattern should be reversed when looking at it from the underside. This is drawn looking from the top of the switch.