Eton 40 Ikeda Coil Harness This wiring harness replaces the trigger module when using the New Black Thunder coil, the wiring harness plugs onto the new ignition coil and then plugs right into the vehicle harness with two wires in a 3-pin plug. If you are purchasing the coil the coil will come with this wiring harness and an NGK spark plug so there would be no need to purchase this harness if you are purchasing the coil it is included.