Add constant siren with only horn output?

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=20001
Printed Date: July 06, 2025 at 1:05 PM

Topic: Add constant siren with only horn output?

Posted By: meanbean
Subject: Add constant siren with only horn output?
Date Posted: October 12, 2003 at 4:44 PM

Hello,

1st time installer here and I need some help in adding a siren to my alarm. Search but couldn't find the solution. My alarm does not have a siren output so I have my siren connected to my horn output. Everything works but the siren is sounding on and off. Is there anyway for me to wire it so that the Horn continues to honk on and off but the siren is constant? Thanks for the help.

Replies:

Posted By: HamiltonAudio
Date Posted: October 17, 2003 at 7:42 AM

you could try wiring a latching relay setup so that when the horn output comes on, it latches a relay open and puts continuous power to the siren. you'd then need a way to unlatch it on disarm (the unlock pulse?) get creative! the diagrams are all here.

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