I have an Ibanez ART300 and I opened up the back of my guitar and saw that there was a black wire that wasn't attached to anything right next to the jack. The black wire has a few tiny frayed wires at the end and I think it is supposed to connect to the back of the jack cause there is a little metal loop sticking out of the jack. I don't really know how this works. I think it might be loose because when i got it (my first guitar) the jack was loose so i tried to tight it from the outside just by twisting it and it might have loosened that wire. Please help