Dave: If you hold the new switch facing you with the 4 blades on top, the top right one is the ground (you must make a short (3-4") ground wire to attach to this blade and then to a ground (pedal support or near by). The next blade to the left, goes to the light, and the next blade to the left goes to the live feed (ignition). So, you are using three blades on the top, and not using the first blade (far left)on the top. The three on the bottom do not get used at all. I hope you can make sence of this, but if you can not please e-mail me and I will try to do better. Good luck. Mark