VW-Beelte Sparkplug wires replacing in correct way, right Jun 14, 2015Got a new set of Bosch spark plug wires! This is how you should install your wires on all air-cooled volkswagen engines. Also when your building an engine and you replaced the distributor. Spark plug wires from distibutor cap to spark plugs Spark plug wires from distibutor cap to spark plugs the original VW spark plug leads were copper wire and there were resistors on the ends of the leads that plugged into the spark plug with the screw on piece left off. AIR Cooled engine don't have radiators..