youre old pickup has a hot wire and ground wire. your new pup has five wires. start and finish of each coil and a bare ground wire. typical duncan wiring for series operation (normal humbucker wiring) is use the black as the hot wire (to volume control or switch), solder the red and white wires together and insulate the connection so it doesnt come into contact with anything accidentally, and connect the green and bare wires to ground (typically the back of a pot)