hey man, I just put a Pro Design kill switch on my 06 Predator . the short wire on the kill switch gets grounded to the frame and the long one goes to the white wire with the red stripe coming off the stater. I got the techs at the local dealership to help me find the correct wire from the stater, spliced it in and everything worked fine. IM me if you have any problems.
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Before you mount the switch, make sure your wire is long enough to reach the stater. I had to move mine down the bars a little. P.S. make sure your bike is the same as mine! I don't know if yours is different or not!