relay for airhorns using hornhonk output.

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93138
Printed Date: May 10, 2025 at 5:40 PM

Topic: relay for airhorns using hornhonk output.

Posted By: mrspeaker
Subject: relay for airhorns using hornhonk output.
Date Posted: April 19, 2007 at 3:23 PM

Hi,I want to use airhorns just for the alarm. My alarm has a horn honk output (-) ,so, instead of going to the factory horn I want to go to the air horns,How would I set up the relay?

P.S. I searched on here and only found out how to hook up the relay through the siren and using a flasher but i don't want to do that since theres a horn honk output already in the alarm unit.

Replies:

Posted By: Velocity Motors
Date Posted: April 19, 2007 at 9:40 PM

85 - (-) trigger from the alarm
86 - COnstant power
87 - Either (-) or (+) for the horn wire to activate
30 - To the (-) or (+) horn wire
87a - NOT USED

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: hotwaterwizard
Date Posted: April 20, 2007 at 1:38 AM

Okay Help me understand why you think you need a relay?

The air Horn Solenoid takes very little power. Just as much as the Relay coil does.

A Relay is not needed.

Just hook the red to Hot and the Black to the Alarm circuit.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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