This is an excellent book if you want to know more about pickups and wiring. Section 1 explains pickups in detail and the variation in pickup manufacturers. Section 2 is all about guitar circuits, design, function and hot-rodding your electronics. Section 3 is full of schematics and technical information. Lots of pictures.
With this book and a soldering iron, you won't run out of ideas of exiting things to try! 128 pages.