can’t get airhorns to work
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=110397
Printed Date: May 10, 2025 at 5:24 PM
Topic: can’t get airhorns to work
Posted By: nycmaximas
Subject: can’t get airhorns to work
Date Posted: January 06, 2009 at 10:10 AM
I'm looking at this diagram from the site
According to the vehicle wiring database, my 2000 Sentra's horn wire is (-) output. It seems that in the diagram the wire going to the light [or in this car the airhorn] is positive?
What I tried was cut the positive wire for the siren and:
87 is the (+) horn wire coming from the alarm brain
86 is the wire from the relay back to the siren
85 grounded
30 to X on light flasher
L on flasher to horn wiring.
That did not work and I'm guessing because I now realize the horn is (-) output. How can I make them work?
Replies:
Posted By: nycmaximas
Date Posted: January 06, 2009 at 10:12 AM
Sorry I made a typo..87 is the (+) siren wire coming from the alarm brain
Posted By: KPierson
Date Posted: January 06, 2009 at 11:38 AM
Are you saying you hooked your air horns up through a flasher????? Your relay won't trigger because you have it hooked up wrong. You need to move the wire you currently have on 87 to 86. The siren output from the brain needs to power the siren directly, and it also needs to supply power to the relay (pin 86). Now, you will need to add a fused 12vdc power source to pin 87. Depending on where the relay is you can go directly to the battery or tie in at the ignition in the car (or several other places). I'm not sure how the flasher will react with an air horn on it. What is the point of using the flasher with the air horn? ------------- Kevin Pierson
Posted By: Mark Mizenko
Date Posted: January 06, 2009 at 3:21 PM
He's using it to pulse the horns!
Posted By: loneranger
Date Posted: January 06, 2009 at 4:15 PM
He's using a light flash add-on to pulse the air-horns from a siren input. If you tell me the make and model of the alarm, I'll show you an easier way.
Posted By: howie ll
Date Posted: January 06, 2009 at 4:31 PM
I'm confused, does the poster want to add airhorns? Does the poster want to run them off the alarm? To check horn polarity, test the horn leads. If one side is always live, then they are neg going. If one lead is always grounded they are pos going.
Posted By: KPierson
Date Posted: January 06, 2009 at 4:46 PM
Would you use a 2 bulb or a 4 bulb flasher to pulse the air horns???? :) It sounds like the air horns already exist and are triggered off the OEM horn relay. I guess it is possible that he is planning on using an electronic flasher that may actually be somewhat predictable. ------------- Kevin Pierson
Posted By: ckeeler
Date Posted: January 06, 2009 at 6:55 PM
KPierson wrote:
I guess it is possible that he is planning on using an electronic flasher that may actually be somewhat predictable.
obvious guy^^
Posted By: nycmaximas
Date Posted: January 07, 2009 at 3:52 AM
KPierson wrote:
Are you saying you hooked your air horns up through a flasher?????
Your relay won't trigger because you have it hooked up wrong. You need to move the wire you currently have on 87 to 86. The siren output from the brain needs to power the siren directly, and it also needs to supply power to the relay (pin 86).
Now, you will need to add a fused 12vdc power source to pin 87. Depending on where the relay is you can go directly to the battery or tie in at the ignition in the car (or several other places).
I'm not sure how the flasher will react with an air horn on it. What is the point of using the flasher with the air horn?
I was going by what was posted in a previous thread about adding my currently installed airhorns to go off with my alarm siren. The diagram was a bit confusing for me because I wasn't sure if I needed to splice into the alarm siren wire or cut it. I was told the flasher will allow the horn to pulsate instead of being a constant sound.
Posted By: nycmaximas
Date Posted: January 07, 2009 at 3:56 AM
OHHHH...
After reading all the comments now I understand the diagram. I guess I missed the little tail on the end of the siren wire which shows that the wire going to pin 86 on the relay is spliced in..
Now I get it! I will try it again.
thanks for the help so far.
Posted By: howie ll
Date Posted: January 07, 2009 at 12:30 PM
Most alarms have an airhorn specific output, this output at least on DEI product would be a neg low current yellow/white on Clifford, brown on the others and it can be set to either be a constant output or oscillate (default). Since your reg horn is neg going, factory horn push AND alarm output to 85, 20amp permanent to 86 and 87, airhorn output from 30
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