Mate, the earth wire just connects to one of the bridge posts (not the pickup). (See attachment "Pit Bull JMA-6 Baritone Guitar Kit Wiring Diagram".) When I say "connect", I just mean that it's kinda wedged/jammed into the bridge-post hole so it's making good contact with the bridge metal. As far as the 5-way switch goes, I opted for a typical Strat style (Tone 1 for the neck pick-up, Tone 2 for the middle pick-up i.e. no tone control on the bridge pick-up. (See second attached PDF named "Wiring Options".) .......... The end result? I wasn't deliriously happy in that the supplied pick-ups are fairly rubbish — in fact, the tone controls make little difference without major movements. I've thought about retro-fitting better pick-ups, but I also own a fairly expensive baritone guitar (Danelectro) that I use for performance, so, as the Pit Bull is just a home practice unit, I've not done any more to it at this stage. Were I to build it again, I think I'd outlay for decent pickups from the get-go. .......... Happy to help with any further questions, although I warn you that I'm definitely not an electronic guru — I'm a muso who just got this kit to teach myself a little more about the finer points of build and set-up. Baritone isn't my main instrument — I mainly play acoustic / solid-body / bass / mando, so baritone is just an occasional novelty for me.