Most anyone can tell you how to wire up the toggle switch. However, you may want to give your system a little more thought. A simple toggle cut-off, by itself, is so easy to defeat. Here's a couple of ideas on different ways to help prevent theft. The idea I use is different than other people. Having something unique may give the car a better chance at discouraging a thief. Also, you don't indicate the size of the switch. It may be too small to work. http://integramod.tripod.com/interior/killswit.html http://www.auto-theft.info/prevention-tips.htm
The simplest thing to do is wire it in series with the positive wire to your coil. Remove the wire from the positive coil terminal. One wire of the switch goes to the coil the other wire to the wire you just removed from the coil.
Now if you are talking about a NHRA required kill switch that goes in series with your positive battery terminal and cable and must be accessable from the outside of your car.
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