I have a Bartolini preamp that I removed from a Pedulla MVP-5 bass when I upgraded the electronics. I am unsure of the model or wiring, since like an idiot I didn't write down the original wiring before removing it. The preamp looks like a TC-1, TC-2, TC-3, or TC-4 package. It only has 4 wires however. Two black wires which are still connected to a tone potentiometer, and a blue and a green wire. There is no red or yellow wire, only the blue and green that are unconnected. I am unsure of what those two wires are, or where to connect the 9 volts from the battery. Any tips? Thanks.