Originally Posted by MoreBassXD
Just want to throw another idea out here. Just had it myself for my own jeep. It works with pretty much any kill switch that uses a relay. Instead of a 4 prong relay you use a 5 prong. You connect your horn to the 87a prong so if they try to start it without the killswitch flipped the horn blares(I have a nice loud airhorn :P) and if I do this I might try to find a was to make it go for 5 seconds or so after they let go of the key. Just long enough for them to freak out and run off.
I love Things To Foil Thieves
Another thought to add to the relay/kill switch idea: a simple 2-channel remote on/off switch that comes with two fobs can be used in the circuit ahead of the relay. That way switch placement is irrelevant.
I get mine from Amazon- outfits that sell car alarms have these. I got the two-function unit because I thought it might be handy to have a light on the second trigger but I haven't done that yet. The last one I got was like $15-$16 including shipping.
A $45 Amazon car alarm can be employed similarly: combined with inexpensive door lock solenoids you can disable the fuel pump AND ignition while also securing the hood, tailgate, and half-doors (in my case) from lift off theft. (My doors only lock/unlock by key or remote- the interior locks have been disabled)