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Here is my kill switch schematic (rough sketch) and the unassuming headphone jack that makes it possible. Its simple, reliable and inexpensive. When its wired in just plug the headphone jack into its receiver and it actuates the relay completing the circuit. The receiver can be hidden anywhere from, inside glove box to (we tossed this around for awhile) using the cigar lighter as the plug in......pretty cool. Oh, and we also as can be seen a red light starts blinking when the system is disabled (another thing for thieves to think about before working on the truck). My buddy used speaker wire to make it look for all intents and purposes, like the headphone jack receiver is for music. Whatcha think y'all?