strobe with alarm

Printed From: the12volt.com
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=8069
Printed Date: May 10, 2025 at 9:39 AM

Topic: strobe with alarm

Posted By: crazycmj
Subject: strobe with alarm
Date Posted: January 13, 2003 at 6:16 AM

I'm new to all this stuff and wanted to have a strobe powered up when my alarm sounds, i used a relay with the connections as follows:

86 - pos siren lead
85 - ground
87 - 12v +
30 - pos lead of strobe

With everything connected my siren and strobe doesnt work, if i unplug the siren lead then make the alarm sound then plug it back into the relat then everything works fine, but after a minute or so the same thing happens, nothing works. Any help is appreciated.

-------------
CrazyCMJ

Replies:

Posted By: finnman925
Date Posted: January 13, 2003 at 6:25 AM

try connecting the siren to the output of your strobe relay (30) and connecting 86 directly to the alarm module.

brian

Posted By: Dan M C
Date Posted: January 13, 2003 at 1:29 PM

posted_image Did it work ?,please let us know.

Thankx

-------------
Dan M C

Posted By: KBToys
Date Posted: January 13, 2003 at 1:30 PM

I am in the same situation as you but I fired my alarm brain trying to do the same thing. Hopefully someone will give us an answer.

Posted By: crazycmj
Date Posted: January 13, 2003 at 1:39 PM

As of now it seems to be working, i was at work when i tested everything out....should i use a diode on the line coming out of the alarm brain to protect from damaging the brain???

-------------
CrazyCMJ

Posted By: djfearny2
Date Posted: January 13, 2003 at 3:53 PM

as long as you use a relay from alarm you ok and i dont see why your first relay setup did not work i dont know i would have to be there sorry.

-------------
Jon
Installer/Help Technician
---coral springs florida---
mecp certification is not always needed. I have it and it has not helped me out at all. my experience out shines it.

Posted By: jcaimhigher
Date Posted: January 13, 2003 at 9:30 PM

If it's a professional supply from Whelen, FedSig, Sound Off or the like then the input wire requires minimal voltage and you could run the output from the alarm to the siren and the supply. Just put a 5amp fuse inline to the supply to be safe and everything should be good. If you got a cheap Autozone strobe I don't know what to tell ya.

HTH
John

-------------
John
jcaimhigher@ixpres.com
Bond of the Blue Beret