Connecting Horn to Siren 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=2741
Printed Date: July 16, 2025 at 8:47 AM

Topic: Connecting Horn to Siren Output?

Posted By: bullzeye
Subject: Connecting Horn to Siren Output?
Date Posted: August 13, 2002 at 2:41 AM

I need help making my horn pulse when my alarm goes off.
I have a relay hooked up to multiple sirens and tried
connecting the 30 from that relay to a flasher "x" and
connecting the flasher "L" to the 86 on the horn relay
85 and 87 were grounded and the 30 goes to the horn (-)
wire. The Horn works but is just solid no pulse. What
can I do or am I doing wrong? Thanks for any ideas?

Replies:

Posted By: honomuboy
Date Posted: August 13, 2002 at 6:36 AM

what if you run the horn off a relay switched by the alarm parking light flash output? You might need to put an isolateing diode somewere in the mix so your horn won't honk when you put on your blinker.

-Just an idea, I could try to figure it out.

Posted By: bullzeye
Date Posted: August 13, 2002 at 8:52 AM

What type of Diode would I need? Do Diode's get very hot
just wondering if having my parking lights on the whole way
to california about 600miles would I start a fire or anything?
Where would you suggest to put the diode near the Parking Light
switch where the alarm ties in to it or closer to the brain?
Thanks

Posted By: bullzeye
Date Posted: August 13, 2002 at 9:14 AM

https://www.the12volt.com/images/addlfwo.gif

That is what I went off of but where the light is I have a relay to
convert the 12v Pulse to a ground pulse but all I get is a constant
blast. I tried a thermal flasher and a electronic flasher with the
same results.

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