Just cracked open my 2011 Highway One Jazz to install the new Audere JX3 Pro 4-band pre that Santa brought! You rock, Santa! Simple question is, my pickups have three wires - two black and one white. I expected a hot (white) and ground (black). Why 2 black wires from the pickups? My first hunch is that they could be split coil Jazz pups, but to my knowledge they're the regular vintage Alnico pups it came installed with.