Need help, does anyone know about the Pickups of Yamaha BBNE1 Nathan East Bass? I want to install (upgrade) a Bartolini NTMB preamp on it, but the original pickup has 3 lead line: 1-non-braided shield wire, 2-red wire, 3- white wire. Now I just follow the NTMB wiring diagram, but it shows only 1 wire to the Blend pot for each pickup. so I thought that might be active pickups, then I wired the red wire to battery wire, white wire to Blend pot, shield wire to ground. but it really Buzz now, especially when I use just Neck or Bridge pickup, it noise really loud. I research some of the information, the Yamaha Alnico Pickups are not active pickup, but why it has red and white wire? and how should I wire it? Please help if anyone understand the wiring works, thanks a lot.