Vehicle Soft Top Alarm System

About the project

Make an alarm system for your soft top; activated by unzipping or cutting through windows.

Project info

Difficulty: Easy

Estimated time: 1 hour

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

30N06L Transistor 30N06L Transistor Other typical transistors will work as well. x 1
Jumper Wire Kit - 140pcs Jumper Wire Kit - 140pcs Need the jumper wire connectors for zippers. x 1
12V Alarm 12V Alarm Recommend getting the loudest 12V alarm you can find. x 1
Rocker Switch Rocker Switch This will be used for the disconnect/kill switch for the alarm. x 1

Hand tools and fabrication machines

Soldering Iron Soldering Iron Your choice of solder melting tool. x 1
Heat shrink Heat shrink For cleaning up and isolating connections. x 1


My Jeep got broken into again, this time by cutting the side window of my soft top. I decided to make a break-wire alarm system that runs across the windows and loops through the zippers. If the cable is cut or a connector at the zipper is unplugged, a 120dB alarm will trigger.

The device was inspired by those anti-theft devices in electronics stores which function using the same break-wire system.

Schematics, diagrams and documents

Circuit Diagram

You can use this circuit or make changes (like adding the kill switch to a lead coming from the battery.


Photo of TPalowski13


Mechanical Engineering Graduate, Youtuber. I like to make dumb builds that I find funny.


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