I'm a bass newb but I have a Ibanez SR530 and it came with MK1 pickups and pre, which didn't sound too great. So, last year I bought a Bartolini NTMB (5.2 A/P) Pre and installed it to the MK1 pups, but today I finally got some Bartolini MK4 pickups. I just don't really know how to wire them, in particular the "hot" wire. If it helps, here is the wiring diagram for the Preamp that I used a year ago: http://img28.imageshack.us/img28/3592/ntmb52.jpg And here is the diagram I am trying to use to install the pups: http://img204.imageshack.us/img204/9090/pickupsx.jpg I have the other wires connected fine, I think, but in the diagram it doesn't really show where the "hot" wire leads to. That's the part I'm lost at, so I have them unhooked. I did plug in the bass to see how it sounds, and it sounds excellent minus a LOT of buzz, so maybe I need those hot wires soldered to something? Any advice would be GREATLY appreciated!