I love the way that the three pickup Gibson Les Paul and SG looks. Crazily cool.
Their wiring, however, seems like an afterthought. That middle pickup is pretty much wasted with the standard wiring scheme.
So let's mod it for heaps more flexibility.
In an electric guitar or bass, it's usually necessary to 'ground' the strings.
By this, I mean that all the strings should have a path to ground — a wire that connects them to a ground point inside the instrument. Usually that ground point will be the back of a pot or the sleeve of the output jack.
When it's properly grounded, you can touch the strings of your guitar and you'll usually hear the background hiss reduce. Yay.
There’s a common misconception that by touching the strings you are grounding the guitar.