How to Install a Car Alarm

Installing a car alarm can be a tricky and complicated process. There are hundreds of different models and methods of installing an alarm. In fact, it would be almost impossible to create a how to guide to cover all of these variations and possible complications. This project is something most people should not hassle with. Most local mechanics should be able to install the device much quicker and cheaper then you can do yourself.

That being said however, do it your self car alarm installations are possible, all you really need is time and patience. Your instruction manual will most likely prove to be more useful than any generic online guide, so follow it step by step. Most car alarm companies offer tech support that can assist with general instructions over the phone.

You Will Need:

When you get ready to install your new car alarm, ensure that you have plenty of time set aside and that you will not need to use your vehicle for the duration of the installation. Most self installations can be completed within a weekend. You will need to ensure that you have a tool set handy (knife, sockets, screwdrivers, crimps, soldering iron, voltmeter etc.) as well as your install kit and instructions. When installing your new alarm, remember to use a volt-meter to ensure that you do not injure yourself or damage your vehicles wiring.

Start by attaching the alarm siren to the under-surface of your hood. Ensure that the feed horn is pointed towards the engine so that water will not get inside it as you are driving. If your alarm kit did not come with a siren mount you can usually avoid having to weld it to the roof by using tie straps. Feed the siren wires through to the interior of the car via the firewall. Most often you can find existing wire holes that you can use. If not, simply drill a small hole through the rubber grommet.

Power Your Car Alarm

Next, attach the alarm’s power cable to your battery. Feed the other end of this cable through to the interior of the car along with the other wires. Once, inside the interior of the car, run an inline fuse, if the cable does not have one already installed. Your fuse size can vary so check the specifications of your alarm prior to attaching the fuse.

Once the cable are run through to the interior of the vehicle; Mount your shock sensors. Each type of sensor will vary so, refer to your user manual for further details.

Next, drill a small hole into your dash where you want to have your LED indicator displayed. Feed the display wires thought the hole and attach to the LED. If your LED is not housed in a display box, you will want to attach the light to the dash using tape or other adhesive.

Once finished with the LED light, find the wires that control your car’s power locks (if you have power locks) and connect the door-lock relay to the alarm relay. Again, if you need help with this step refer to your user manual or call your alarm manufacturers support line.

Attach the starter wires (found underneath the steering column to the starter disable relay. Connect the relay to the alarm device before you mount the alarm module to the bottom of your dash.

Click Here for a sample wiring schematic.

For your convenience, here are some of the more common car alarm installation manuals. If you know of another manual that we do not have listed, please let us know so that we can add it. * Note: each of these manuals was obtained via public ally available information.

The Vellman-Kit
The DEFA Auto Alarm Series
Commando Alarm Series

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