The thin black wire is the signal wire (7.25k ohms DC resistance), the red and white wires are the centre coil connection (roughly half the total DC resistance) at 3.6k ohms DC resistance), and the 2 bare twisted wires are the cable screen and signal ground. So for simple humbucker use, just put some heat shrink or insulating tape over the bare ends of the red/white wires, connect the 2 bare twisted wires to the back of the volume pot and solder the black wire to the input lug on the volume pot.