This may sound dumb, but i don't know so that's why i'm asking!
I've just bought one of those simple all in one pickup systems for my acoustic, a single coil connected to volume and tone pots, connected to a jack. Easy to install. But my question is why is there no earth/ground wire? If i put this onto an electric, i would have to ground it wouldn't i with the black wire from the back of the bridge? So why do this not have one, and does it need one? (if so, surely they would include it).