||04-03-2010 10:27 PM
A "Loud" Twist On The Kill Switch Mod
All of this talk about theft and TJ security started me thinking. Most of us have a kill switch hidden somewhere, alarms and whatnot. And then there is this
Updated – TJ Theft Protection ADE/ADE-II w/Light Chaos - JeepsUnlimited.com Forums
This is a great idea but I was not comfortable with another relay in the Heep and always being on when the Heep was on. Not sure why, but somehow this led me to my motorcycles, past and present. I have always wired in a kill switch on them too, only it was also hooked up to the horn. And it is easily done on the Heep too. Most of us used a SPST (single-pole, single-throw) switch. Well, if we change that out to a SPDT (single-pole, double-throw) and get ourselves an extra horn, it can be done.
How to do this?
Most of the circuits we interrupt with the kill switch has +12v going to it only when the Heep in on. With a voltmeter, find out which wire going to your switch is the +12v in (upstream side). Connect that wire to the common or center contact on your switch. Connect the downstream side, which would normally go back to whatever circuit you interrupted, to one of the other terminals of the switch. Then connect the last terminal to your extra horn that you had laying around (or a cheap junkyard find). Now, when mister thief jimmys your ignition, if your switch is off, the horn will sound off instead. I mounted my horn inside the cabin of the Heep. I may come back to a dead battery, but at least, I will come back to my Heep. You only need to make that the fused circuit that you connect your kill switch to will handle the current of your horn. Normally, a 10a or larger circuit should do it. If you think, or do not know, if the point in the circuit where you cut in your kill switch is downstream of the fuse of not, add one into the wire going to the horn. And, of course, make sure that your horn is grounded.
You could even do this with the disable relay mod shown in the link. Just route a new wire from your relay contact #1 to your horn, and done!
Woe be to the poor fellow that forgets to flip the switch before starting my Jeep, it is loud in there now! (Yeah, I know, I will probably be "that guy")