Anyone made their own kill switch?

1986LX2002 · Nov 16, 2004

Ok Joe new post, now whatta have for us for a kill switch?

Original Post, http://forums.stangnet.com/showthread.php?t=517917

jrichker · Nov 16, 2004

As promised...

On 86- 91 cars the fuel pump relay is under the seat, 92 and later cars, the fuel pump relay is under the Mass air duct on the passenger fender well.

Note that the wire colors changed in 1991, so there are two different descriptions.

86-90 model cars:
Cut the red/black wire going to the fuel pump relay. Splice a 16 or 18 gauge wire into the wire and connect it to one side of the switch. Connect the other side of the switch to the other end of the red/black wire going to the fuel pump relay. When you are done the switch should be in the middle of the spliced red/black wire that goes to and comes from the fuel pump relay. Using the control side of the circuit allows you to use light gauge wire and light duty switches. There is less than 1 amp going through the circuit, so you don’t have to worry about voltage drop across the wiring depriving the fuel pump of electrical power.
See http://www.autozone.com/servlet/UiB..._us/0900823d/80/16/71/3c/0900823d8016713c.jsp for 79-88 model wiring diagrams.

91-93 model cars:
Cut the Lt Blue/Orange wire going to the fuel pump relay. Splice a 16 or 18 gauge wire into the wire and connect it to one side of the switch. Connect the other side of the switch to the other end of the Lt Blue/Orange wire going to the fuel pump relay. When you are done the switch should be in the middle of the spliced Lt Blue/Orange wire that goes to and comes from the fuel pump relay. Using the control side of the circuit allows you to use light gauge wire and light duty switches. There is less than 1 amp going through the circuit, so you don’t have to worry about voltage drop across the wiring depriving the fuel pump of electrical power.
See http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp for 89-93 model wiring diagrams.

1986LX2002 · Nov 16, 2004

Alright! Thanks Joe, looks like i'll be doing something this weekend. Thanks again.

Fishhawk · Nov 16, 2004

1986LX2002 said:
Ok Joe new post, now whatta have for us for a kill switch?

Original Post, http://forums.stangnet.com/showthread.php?t=517917

Also pretty easy to install a starter or ignition cutoff switch. Just find a hot line from your solanoid, tap into it, run wires to a toggle switch under your dash.

crazypete · Nov 16, 2004

I put the lead wire that powers the ignition through the now unused foglight switch. The car will not run unless the foglight switch is pushed in.

Sometimes the best place to hide something is right out in the open because that is the last place anyone will look. I think the FP relay trick is too common to fool an experienced thief familiar with what he's stealing.

I would do something more exotic like kill switching the power supply to the ECU or the ignition system or.....being downright evil and putting a vise clamp on a fuel hose somwhere out of sight. The car will start and run and die half a block away from fuel starvation. It will idle but never do more. The aggravated thief will give up and leave.

Have fun all!

89lxsport50 · Nov 16, 2004

crazypete said:
I put the lead wire that powers the ignition through the now unused foglight switch. The car will not run unless the foglight switch is pushed in.

Sometimes the best place to hide something is right out in the open because that is the last place anyone will look. I think the FP relay trick is too common to fool an experienced thief familiar with what he's stealing.

I would do something more exotic like kill switching the power supply to the ECU or the ignition system or.....being downright evil and putting a vise clamp on a fuel hose somwhere out of sight. The car will start and run and die half a block away from fuel starvation. It will idle but never do more. The aggravated thief will give up and leave.

Have fun all!

You just gotta hope it doesn't die on a railroad track.

fiveofanatic · Nov 16, 2004

I have a cutoff to the starter on my '91 LX. I used a GT headlamp/foglamp switch, & wired it to the starter trigger wire @ the solenoid. I removed the blank sticker from my LX switch & swapped it out with the foglamp emblem on the switch, so it still looks like an LX switch with the one non-functioning blank spot. Got to turn the switch on for the starter to activate & looks bone stock.

I did the same to my old '90 LX convertible, & my wife had battery trouble with it one day when I was not around. A shop installed a new battery for her, but it wouldn't start. They knew there was a cutoff somewhere, but could not find it.

dastang2 · Nov 16, 2004

i got one of those jet ski switches that you wrap around your arm and if i get thrown out the window, the car will die, lol just kidding but that would be a cool switch to put in your glove box

nmcgrawj · Nov 16, 2004

jrichker said:
As promised...

On 86- 91 cars the fuel pump relay is under the seat, 92 and later cars, the fuel pump relay is under the Mass air duct on the passenger fender well.

Note that the wire colors changed in 1991, so there are two different descriptions.

86-90 model cars:
Cut the red/black wire going to the fuel pump relay. Splice a 16 or 18 gauge wire into the wire and connect it to one side of the switch. Connect the other side of the switch to the other end of the red/black wire going to the fuel pump relay. When you are done the switch should be in the middle of the spliced red/black wire that goes to and comes from the fuel pump relay. Using the control side of the circuit allows you to use light gauge wire and light duty switches. There is less than 1 amp going through the circuit, so you don’t have to worry about voltage drop across the wiring depriving the fuel pump of electrical power.
See http://www.autozone.com/servlet/UiB..._us/0900823d/80/16/71/3c/0900823d8016713c.jsp for 79-88 model wiring diagrams.

91-93 model cars:
Cut the Lt Blue/Orange wire going to the fuel pump relay. Splice a 16 or 18 gauge wire into the wire and connect it to one side of the switch. Connect the other side of the switch to the other end of the Lt Blue/Orange wire going to the fuel pump relay. When you are done the switch should be in the middle of the spliced Lt Blue/Orange wire that goes to and comes from the fuel pump relay. Using the control side of the circuit allows you to use light gauge wire and light duty switches. There is less than 1 amp going through the circuit, so you don’t have to worry about voltage drop across the wiring depriving the fuel pump of electrical power.
See http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp for 89-93 model wiring diagrams.

I tried going on there to find a layout for the 95. I couldnt find it....any help?

jrichker · Nov 16, 2004

nmcgrawj said:
I tried going on there to find a layout for the 95. I couldnt find it....any help?

For 94-98 model Mustangs see http://www.autozone.com/servlet/UiB..._us/0900823d/80/1d/db/3c/0900823d801ddb3c.jsp. Same principal, maybe different wire colors.

joelliott · Nov 17, 2004

in my 85gt I have thought about using the fuel door release button inside the glove box for the switch. totally stock and isnt doing anything now. But like the guy above said if someone you know tries to drive the car without knowledge of the switch it could cause alota problems. Like your mechanic, or family, etc. That has been my hold back.
Joe E.
Any comments if the above info on hookin a switch up for 86+ stangs will work on 85s?

astronut1885 · Nov 17, 2004

I'm going to do something really tricky. I have an MSD 6AL, and I'm going to use that as the cutoff. Since it's hardwired in, there's no way around it. I'm going to get the AFM switch panel that goes into the ashtray. Then I am going to wire all 4 switches into the ground wire for the MSD. I am going to make it so that all 4 have to be "on" for the MSD to power up and give ignition. Then I am going to flip some of the switches backwards, so you get a combination lock of sorts to get spark. If all 4 aren't "on", then you no go. and there's a whole crapload of combinations that I could come up with. I just gotta order that panel....
Oh, and since my MSD is hidden, there's no way to find it and reground it to bypass the switches. It'd take a long time with my alarm going nuts to trace the switches back to the box...

Anyone made their own kill switch?

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