Hi, I have a TRB6p and I'm upgrading the pre amp to obp3 and still have issues with the pickups connection and the ground... Basically this pick ups have 3 wires also, but the colors are different. There's 1 thick cable that has the white wire and it's rounded by I guess, the ground not cloth covered wire. Additional to that, there's another thinner black wire that I don't know what to do with it. Also, I'm having some issues with the blending pot that doesn't seems to be working so well and also I'm getting a lot of ground noise that I don't know how to fix.. Any help? Thanks!