5 Best Ways to Install an Anti-theft Kill Switch in Your Car

Post by 
Tom Schaffer
Last updated on 
February 17, 2021

In America, a vehicle is stolen every 42 seconds. Car theft is a major problem and can cost you all the money that you have spent on buying the car. This is why anti-theft kill switches are necessary, as they provide an added layer of protection against the theft of your vehicle. In this article, we will recommend some anti-theft kill switches and provide you with a Do-it-Yourself guide to install a kill switch in your car. 


These days, the market is flooded with high-priced car alarm systems. A relatively cheap alternative is to install a hidden car kill switch, which disables the car from getting started. This switch will protect your car, even in the event of the high-priced alarm system being bypassed by thieves. 


Most kill switches work by stopping the electricity flow from the vehicle’s ignition system and its battery or through a fuse that works on an essential part, like the fuel pump. 

How To Install Kill Switch  

The following are the 5 best ways to install a kill switch in your car:

1. Fuel Line Shut-Off Valves

Preventing the car from supplying fuel to the engine is a sure way to prevent it from starting. The car might crank over, but never fully start. This will make the thief think that the car has engine problems. 


Therefore, installing an in-line fuel cut-off switch is a fairly straightforward way of preventing the supply of fuel to the car engine. To install this on your vehicle, you will need to get under the car and search for the fuel line. After you find it, you need to cut it into half, at the desired location. Note that there might be fuel leakage, but if you install the switch fast, the fuel draining should not be much. After cutting the fuel line, slide the shut-off valve on both ends. In addition, fix some small hose clamps to tighten the fuel line hose to the valve. 


However, an in-line fuel cut-off switch might not be the best anti-theft kill switch to install, if you plan on using it daily. This is good only when you leave the car in the garage for a long time. This is because, every time you start and stop the car, you need to crawl under the car to activate and deactivate the kill switch. This is not possible during everyday usage.  


Check Price on Amazon: Fuel Line Shut-Off Valve


2. Car Battery Disconnect Switch

A car battery disconnect switch disables power to the ignition, thus preventing your car from starting. This is, in fact, one of the easiest kill switch options to install in your vehicle. In order to install this switch, you will be required to unscrew the negative cable connected to the car’s battery. Once it is off, you need to slide the battery cut-off switch on to the negative terminal of the battery and tighten it up. Following this, you have to slide your negative battery wire onto the battery disconnect switch and screw it on. 


Most of the car battery disconnect switches have a turning knob lever. Some even have a key, which is used to turn the switch off and on. One of the major disadvantages of using this switch is that you will have to open your hood each time to get to the battery switch. 


Check Price on Amazon: Battery Disconnect Switch

3. Remote Controlled Car Battery Switch

This is one of the most convenient ways of using a kill switch and it allows you to quickly disable your car during your day-to-day usage. You neither need to go under the car, nor do you need to open the hood and turn a knob to prevent your car from starting. 


You must go for the E-Kylin DC 12V Electromagnetic Solenoid Valve Terminal Master Kill System, as it is one of the best remote-controlled car battery switches. It is a full kit, which is ready to be installed on your car within minutes. It uses a latching relay and requires power only when it is switching on or off. It does not require any power to hold it in either position and thus, saves your car from battery drain. 


Check Price on Amazon: Remote Control Car Battery Switch

4. Fuse Box Kill Switch

In-line fuse bypass switch is a very effective anti-theft kill switch for your vehicle. A common way to prevent theft is to take out a fuse, such as the ignition fuse or the fuel pump fuse, which in turn, prevents your car from being started. However, you need not manually pull out the fuse each time to get out of the car. A fuse box kill switch helps you in this regard. It allows you to install a fuse bypass switch in an area that is easy for you to reach and switch it on or off. However, one of the drawbacks of this setup is that the wire that goes into the fuse box might stick out a bit, thus preventing you from closing your fuse box lid completely. 

You will require the following parts from Amazon to install a fuse box kill switch: 

Toggle switch: 12V 25A Toggle Switch

Crimp connector: Female Spade Quick Splice Crimp

Inline Fuse Wire: 12 Gauge ATC Fuse Holder

Fuse Socket Connector: Fuse Socket Connector Kit

Wire crimping tool: Multi-Tool Wire Stripper/Crimper/Cutter

5. Ignition Wire Kill Switch

This is probably one of the best kinds of anti-theft kill switches for any car. This kind of setup makes use of a toggle button or a physical switch, which is hidden somewhere in your car, usually around the car seat or under the dashboard area, so that it is easily accessible every time you get in and out of the car. The working principle of this kill switch is simple: a switch is added to the wire that comes off your car’s ignition switch, where you turn the key. 

With the help of a wiring diagram of your vehicle, you will be able to find out which wire is the ignition cable and which one must be cut into. After cutting the wire, you can either solder the ends of the wire into the switch or make use of extra connectors and crimp it on. The latter process requires no soldering.  

You will require the following parts from Amazon to install an in-line ignition wire cut-off switch: 

Crimp connector: Female Spade Quick Splice Crimp

Heat shrink for soldering: Heat shrink tubing assortment

Toggle switch: 12V 25A Toggle Switch

Wire crimping tool: Multi-Tool Wire Stripper/Crimper/Cutter


An anti-theft switch is an extremely important device for your valuable vehicle. It is an economical product and can save thousands of dollars spent on buying a  car. There are several types of anti-theft switches and we have listed each one of them in this Do-it-Yourself guide. However, you must be extremely cautious while installing any of these and especially while working with your car’s wiring system. Make sure that you carefully read your car’s user manual diagrams and have a good understanding of its electrical system before trying to wire anything in. 

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