The wires are part of the coils and cannot be replaced. Some guys solder on new wires and whatnot.. but I tried a trick on my K6 that worked out well. Take a screw and snap the head of it off. Thread one end into the old wire and the other into the new wire and complete the job with some heatshrink. As long as you use a good conductive material that will bite into the old and new wires, your golden.