Hi
I found this article about how pickups are antennas and how to silence the hum in a strat.
http://urthman.jsent.biz/music/silence.html
I figured out a wiring diagram, because I didnt understand very well the one provided, but it didnt work. Maybe because my 5-way switch is different. It has only one side. It came with my MN4 Fender mexican stratocaster "squier series" .
I tried to contact the guy who wrote it he but didnt get back to me. And didnt found any other pages with a reference to this link.
Please take a look and let me know.