follow the wire loom on the frame by the oil tank fill plug(left side). Follow it up the frame rail until you come to the plugs. Just under the hood. There will be two pairs of wires and plugs. You will see a pair of wires, red and white. These are the two you want. Splice the long wire from the kill switch into the white wire and splice the short wire into the red wire. I did it this way as I learned that on this forum and it works great. No need to ground anything.