IIRC, the wires are not resistor but the plug cap end is. The caps are made in a non-resistor form but I was never able to locate them. If your wires and cap/rotor are old/original, it is time to replace them, anyway. They don't last forever. Many also suggest a new, stock, coil after many years have passed on use of the original because the spark output can weaken. I have not done that as of yet on my cars but it is on my list.