Siren negative 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=71068
Printed Date: May 22, 2024 at 7:36 AM

Topic: Siren negative output

Posted By: romic00
Subject: Siren negative output
Date Posted: January 18, 2006 at 7:16 PM

Hi i have a bulldog delux 500 remote starter and the output for the horn/siren is a negative wire. I have a siren from an alarm i had before and i am just wondering how can i wire it? In the manual it saysthat the wire is a negative 200ma output and should only be connected to the cars horn. How can i connect this siren? if i have to use a realy how do i wire it thx.

Replies:

Posted By: Mike M2
Date Posted: January 18, 2006 at 9:15 PM

Use a relay. 30 and 86 get 12V+. 85 goes to your 200ma negative horn output. 87 goes to the siren positive. Ground the siren negative.

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Mike M2
Tech Manager
CS Dealer Services

Posted By: auex
Date Posted: January 18, 2006 at 9:51 PM

romic00 wrote:

In the manual it saysthat the wire is a negative 200ma output and should only be connected to the cars horn.

Be aware that the wire in question is probably designed to honk the car horn. If you hook up a siren it will do the same, pulse the siren for a second-pause-repeat.

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Certified Security Specialist
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Posted By: romic00
Date Posted: January 18, 2006 at 10:59 PM

What do you mean is that bad? if i hook it up?

Posted By: dualsport
Date Posted: January 19, 2006 at 3:06 PM

It means the siren won't sound continuously when the alarm is sounding off, the way it's normally supposed to. Other than that, it won't harm anything.
If you don't mind the intermittent siren sound, then you could hook it up that way; it'd definitely be more distinctive so you can identify your car out of a sea of wails- posted_image

If there's really no other output from the alarm that has a continuous output, it wouldn't be hard to make up a circuit to stretch it out and make it continuous, but I'd check first to see if there's another output that comes on steady when triggered, and just use that.

Posted By: dualsport
Date Posted: January 19, 2006 at 8:10 PM

However it's done, make sure it unlatches after the alarm times out, or the neighbors may get restless and bust something-

Posted By: dualsport
Date Posted: January 21, 2006 at 2:02 AM

This takes an intermittent horn honk output (-) and outputs a steady 12V for a siren, by stretching out the on time. If the horn honks less than once a second, the R1 or C1 values can be increased to bridge the gap. posted_image