What kind of alarm is this?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=45010
Printed Date: May 03, 2025 at 8:20 PM

Topic: What kind of alarm is this?

Posted By: boyzWidToys
Subject: What kind of alarm is this?
Date Posted: December 12, 2004 at 7:44 AM

I was curious. I picked up my freinds new truck for him (2003 HD diesel chev) and.. it has some theft deterant system installed.

To start the truck you turn the key, watch the coil indicator go off, then press the brake, then turn the right indicator on and only then do you turn the key to start it? otherwise it won't turn over?

is this a home made job? or is this something you can buy?

Replies:

Posted By: jimmeezgolfvr6
Date Posted: December 12, 2004 at 9:17 AM

sounds to me like the starter wire has been cut, connected to a relay at terminals 87 and 30, and the relay is energized by the brake signal and the turn indicator signal. pretty nifty idea actually. possibly more than 1 relay used. likely to be done by someone who's a fairly experienced installer.

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all problems can be resolved with a hammer

Posted By: hagmanti
Date Posted: December 12, 2004 at 9:35 AM

It's a variation on the last diagram here. Instead of having one remote turn on, there's two latching relays w/ two turn ons (probably a total of 6 relays).

Do the brake lights and right turn signal flash when you do all this? If so, then only 3 relays necessary...

Me

Posted By: auex
Date Posted: December 12, 2004 at 11:47 AM

It is nothing more then a passive starter kill system. As far as being "homemade", these can be made from just relays, but they are available commercialy.

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Certified Security Specialist
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