Thread: Security Fuel Cut-off

the starter can be interrupted by breaking the black with white stripe or black with yellow stripe 12 awg wire that goes to the starter solenoid. it can be traced from the ignition switch to the clutch safety relay in the engine bay back to the starter

also find the fuel pump relay trace the wires back to under the dash board and wire in a switch preferable on the ground side. not the ecu trigger side. if you want to get fancy you can use stock switches in different locations that no one uses or hide switches in places where people it wont look obvious that your looking for a button

Ok... my only issue is doing this on my own. I'm not at all knowledgeable of the fuel system or starter system.

Get creative and don't post your solution on the forums. That'll improve your security even more.

My wiring harness is deep in a box in the shed, or I'd go get some details and specifics.

Basically, what I would do for the fuel pump is this. Pull up the rear seat and you'll see the cover plate for the fuel pump, as well as the harness running to it. Use a multimeter (they can be had for near nothing at a harbor freight or even most auto parts stores these days) to probe the wires and find the one that has 12v when the car is on and nothing when it's off. Pull a pair of wires from wherever you want your switch to be, and then cut the wire by the fuel pump. Splice one of the new wires to one end, and the other to the other end (solder or crimp, your preference, but do it RIGHT). Hook the other ends to your switch so that they're connected when the switch is turned on and disconnected when off. Hide switch. Done.

You do the same thing do the starter solenoid if you really want to do both. My opinion is that a single layer of added security will foil just as many people as doing both. The real pros won't even care, they'll just load the car on a flatbed or dolly and be gone.

Better yet, have it cut the wire to the coil instead of the starter. The engine will turn over but won't fire. The wasted time and the noise of the engine turning over and not firing will probably cause most thieves to decide it's not worth it and GTFO.

I like the idea of a cheap remote-entry module (separte from your alarm) to tie in a relay that will cut the power to the fuel pump.

having it hidden in the car somewhere and you can remotely cut it off an on.

the thief would never find it.

Thanx... I think I will do a switch for both in a well hidden location and I think I have an awesome idea.

My car isn't work much at all....Just a simple easy piece of mine is all. I'm actually looking into a 4 digit pass code switch with a key. Which is pretty sweet in general.

When i did the alarm install on the Sentra i used all factory wires and hid the brain up in the dash where no one could see it. I did the rewiring at the same time so when i was done i just tapped and loomed the whole harness. There was no way to trace wires, which is key. If you install an alarm in the normal location i could bypass it in a few seconds. And i love when people put the siren in the engine bay on top.

What ever you do use the shortest wires possible and hid them well. Use the FSM to tell where the wires are. All of the wires can be found in the kick panel or behind the fuse box.

This I remember a MR2 had this setup and it was simple and worked excellent.

Probably an overkill, but what about a line of say 10 switches, that would have to all be flipped in a specific order to complete the circuit...

say
_ _ _ - - _ - _ - with _ being flipped down, and - being flipped up.

You said it.

I think just a simply inline switch is really the best idea. It's simple... and really easy to put somewhere where it looks stock and stealth.