The Pro II Strat has polarities and coil directions 'backward' compared to other Fender SSS configurations. Below is the actual Pro II setup. How to wire in a Cool Rails bridge so that it preserves hum cancel with stock middle single coil--without splitting the Cool Rails?
the cool rails is humcancelling, adding a third coil will add hum. if you want the notch position to be humcancelling, you need to split the cool rails