Kill Switch

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Nov 17, 2004 | 09:16 AM

weymouth

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Kill Switch

I am interested in installing a hidden kill switch in my '89 F150 Custom, 5.0L EFI, 4x4. What wire(s) should I cut and route through a switch?
I've done this before on older, non EFI cars, but I'm not sure what would be the best way to do it to a fuel injected truck with electric fuel pumps. Thanks.

Nov 17, 2004 | 09:42 AM

billyjoe

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From: Here

I always tap into the Park/Neutral ignition lockout switch on the trans, that way it thinks it is in gear and won't start.

Nov 22, 2004 | 12:54 PM

Aftrmidnite

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I like breaking the fuel cut off switch wiring. This way they are away from me when the vehicle dies and I have a chance to get away too. Car thieves in my area are likely to shoot their victims if something goes wrong.

Nov 22, 2004 | 01:32 PM

weymouth

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Quote:

Originally Posted by Aftrmidnite

Sounds like a tough area to live. Actually, my need for a kill switch is because my locks tend to freeze up in the winter. Last year I twisted off a key while standing in Lowes parking lot in zero degree weather. I'd like to be able to disable the truck with a hidden switch and then leave the truck unlocked. I'm 99.99% certain, I can hide a switch that can't be found in less than a few hours

Nov 22, 2004 | 06:57 PM

midlf

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switch cut off

I would go for the feed to the fuel pump relay. I would also use a two pole SAE connector with one half of the connector shorted. When I left the truck I would just take the shorted half with me. Even if the thief finds it and knows what it is it would stop them. They may not have any idea what it is even if they find it. Then the thief would have to have a jumper. I have a damn tough time getting a jumper to stay on one of these connectors when I know what I'm trying to do. An SAE connector is the same type as the flat 4 pole trailer plug. Just use the two pole version. Truck will crank but not start. Just make sure the rubber covered pole is the feed to the connector so it does not short out.

Nov 22, 2004 | 06:59 PM

midlf

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lock freeze protection

I've found that if I shoot some WD-40 on the lockplate and cylinder about every two weeks that my freeze up problems don't happen anymore.

Nov 23, 2004 | 09:15 AM

wickymustang

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I am about to put a kill switch in my 95 EFI, but I have never put a killswitch in a 5spd, what should I have it linked to? I was thinking the fuel pump relay so that way even if they try to push start it won't get any gas, no gas, no go.

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Nov 23, 2004 | 10:13 AM

weymouth

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The fuel pumps and EFI in this truck are all original and as of yet, unserviced. That, along with that there seems to be a bunch of fuel pump problems related to dual tank trucks, I'm a bit nervous about tapping into the fuel system wiring. I'll probably just switch a coil wire, but instead of using a basic single throw switch, I'll use an additional relay and a momentary contact switch to create a latching circuit. Momentary switches are much easier to hide.

midlf, a few years of WD40 in the locks ate away the paint around and below the cylinders. I recently replaced my doors with a pair of '92s. Ironically, the latches from my 89 doors were in better shape. I doused them well with a light lithium based grease before installing them in the new doors, but last week, the temps dropped to below freezing and the locks gave me some trouble.