How to Install a Car Alarm in a VW Beetle

Written by ehow cars editor
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Installing an alarm in a VW Beetle requires considerable knowledge of car electrical systems, especially on the classic Beetles of the past. Older VW Beetles have likely had multiple electronic add-ons installed over the years or even complete rewiring of the car itself. Make sure you have a wiring diagram no matter which model Beetle the alarm is going in.

Skill level:
Moderately Challenging

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Things you need

  • Alarm kit with vehicle wiring adapters
  • Drill
  • Screwdrivers
  • Zip ties

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  1. 1

    Read the alarm manual carefully and ensure you fully understand the wiring diagram. Open the hood on a newer Beetle or lift the backseat on an older model. Remove the positive battery cable from the terminal and connect the alarm power wire.

  2. 2

    Mount the alarm siren under the hood, facing the engine in a later model Beetle. Run the wires through the firewall and pull them into the cabin, under the dash. Run a classic Beetle's power wire under the carpet of the passenger seat and into the dash.

  3. 3

    Secure the shock sensor as instructed in the alarm manual. If the vehicle has power locks, locate the lock relay and attach the alarm lock module.

  4. 4

    Locate the starter wire in the ignition harness behind the steering wheel and connect the start disable relay. Drill a small hole in the dash for the LED light or use the existing light on newer models.

  5. 5

    Connect all of the wires to the alarm control module and secure the module as far into the dash as possible with zip ties. Classic models have a great deal of room behind the radio for a more secure installation.

  6. 6

    Reconnect the positive battery cable on the VW Beetle and test the alarm. Adjust the alarms sensitivity and secure any loose wires with zip ties.

Tips and warnings

  • Weaving the alarm wires into existing wire bundles makes them more difficult for a thief to identify, but be careful with old wiring as the cover may be brittle and flake away.

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