Qs on adding siren to horn 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=20144
Printed Date: July 18, 2025 at 4:13 AM

Topic: Qs on adding siren to horn output

Posted By: meanbean
Subject: Qs on adding siren to horn output
Date Posted: October 15, 2003 at 2:12 PM

I am trying to add a siren to my factory/OEM alarm and note that there is only a pulse horn output available. When I have the siren connected to this output, the siren is coming on/off with the horn and is not continuous like a "normal" siren. I would like it so that the siren will remain continuous, so I can hear all of the tones cycle through, and the horn to continue to honk (on/off). If I connect a Constant to Momentary Output relay, as shown in the Relays: Special Applications, will this work for me? Thanks for the help.

Replies:

Posted By: auex
Date Posted: October 15, 2003 at 5:49 PM

It wouldn't work for this application because once it would turn on what would turn it off? What brand of alarm is it, other then factory?

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Posted By: meanbean
Date Posted: October 15, 2003 at 11:50 PM

Can't find any makers on the BCU to note brand but it is the OEM alarm found in a 1999 Nissan Maxima. Do you have any suggestions that might work for me to get this siren hooked up?