Lots of ideas--a "kill" switch on the power side of the coil isin't a bad idea..it'll prevent the "joyrides" that most kids and amatuer thieves would otherwise try. A pro, however, will work right around it by simply using a jumper wire from the battery or hot side of the starter solenoid to the + terminal of the coil, bypassing the igntion switch and any "kill" switched wired in that circuit. <br><br>A different twist on that is to wire the "kill" switch to short the + terminal to ground, or to wire the "kill" switch into the - side of the coil, either leaving it open all the time, or shorting to ground all the time-either way, the plugs won't fire because the points won't making and breaking the ground circuit to get the coil going. A thieves' jumper wire won't do any good in that case-but they know the usual places to look for any "kill" switch, so it still might not prevent your Bronco from being "borrowed".<br><br>A fuel line lock is a good idea-without fuel, no amount of rewiring is going to get the Bronco going-and it's hard to rig up an alternate fuel supply line in a few seconds.<br><br>Chaining the tranny and T-case shifters together in some strange gear combination would work-but it's kind of a hassle to do that everytime you jump out just to run into 7-11.<br><br>If a REAL pro wants your truck, he's going to get it-even he has to use the winch on a flatbed wrecker to drag it, wheels locked and all, up on the flatbed and away. In less than a minute, it's gone. You could use those "spike guns" contractors use that drive steel spikes into concrete to give yourself an anchor point in the parking lot to attach a chain to, then wrap it around the frame and lock it, but that would take a while...not to mention being rather loud -and it tends to annoy the parking lot security cops. <br><br>You could get REALLY creative and use things like neon transformers or electric fence power supplies to charge various metal parts of the truck (steering wheel, shifters, door handles)...or mace/tear gas dispensers wired to fire into the driver's seat unless the correct starting procedure is followed...use your imagination here.<br><br>Or, you can live in Texas and leagally carry a concealed weapon. A .45 is hard to argue with.<br><br>Guess which method I use.