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wiring additional sirern

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=110656
Printed Date: May 21, 2025 at 4:31 PM


Topic: wiring additional sirern

Posted By: kandyman67
Subject: wiring additional sirern
Date Posted: January 14, 2009 at 5:52 PM

I was currious if its a bad idea to tap another siren into my original they are both the 6-tone sirens. Will the alarm support additional power for both? if not how do i hook up the relay to the sirens(prolly stupid question but i dont really know)I am thinking of wiring the second siren underneath the back of my navigator, there is a grip of room back by the spare tire and it should be up high enough... what do you think?

Thanks!!



Replies:

Posted By: loneranger
Date Posted: January 14, 2009 at 6:05 PM

A relay is recommended. Your alarm's siren output may not be able to produce enough current for both sirens. Also, mounting a siren underneath the vehicle will expose it to all the harsh elements of the road. Mounting it above the tire would keep it more protected. Make sure that a serviceman or mechanic can remove the tire, without danaging the siren.

Here is the wiring for the relay.

  • #87 to a fused ~5 amp constant 12v+.
  • #30 to both siren positive wires, using a ~3 amp in-line fuse, for each siren.
  • #85 to ground.
  • #86 from alarm's siren wire, using a ~1amp in-line fuse.
  • #87a is not used and insulated.


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Posted By: CutDog504
Date Posted: January 15, 2009 at 5:15 AM
I've done numerous installs with 2 sirens on the alarms output wire with no problem. But thats the definite most I'd go with, 3 would definitely need a relay. I've even done alarms with 5 and 6 sirens, AND the factory horn honking. An alarm that loud will wake the dead. Even arming and disarming it will wiz off all your neighbors. Another tip: if mounting under the vehicle, try to hide it in or above the frame rail. This does two things, it shields it from water or mud splashing up into the siren, and it also somewhat hides it from a thief's view.





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