I hooked up the air horn to my siren...works great...annoying as hell...thats the point....but how do i keep the siren from going off when i press the horn??

 

did your horn normally honk when the alarm went off?? if so you are gonna need to probably get a relay and maybe some diodes to stop it.. not sure at all agian tho.

 

i purposely hard wired my air horn to go off when my alarm goes off....but one side effect is that my siren goes off when i press the horn.....i don't want that....any ideas?


I need something that will make electricity flow only one way thru a wire

 

Place a diode on the output from your alarm.

 

what kind of diode?

 

hey dangsr how did u hook up ur siren to ur horn? i'm just curious b/c my siren itself isn't "annoying" enough!

 

splice the positive from the siren to the positive to your horn switch....works great
only draw back is that your siren goes off when you press your horn....I fixed that today by getting a diode at the electronics store for 35 cents....it allows the electricity to flow only one way

next step is more sirens

 

Make sure you add a relay as you add more sirens.

 

doesn't ur alarm have a "horn/pulsed output?" thats what I hooked up my air horns too.. when the alarm goes off.. the siren goes off as normal.. and then the air horns are pulsed on and off... when i press the horn the siren doesn't go off...

 

why do I need a relay when adding sirens....can't I just splice into the positive lead of the stock siren line?

 

Eventually you will hit a point where your alarm will not be able to supply enough current to all your sirens. I usually recommend a relay after two sirens. You should also have a relay off the siren wire for your air horn.

 

Hello....McFly....J/K ...as stated the alarm output can only handle one siren on the avg...if you want to add more or horns you need to add relays and diodes to isolate thecircuts from each other ( why when you hit your horn the siren goes off..........Wait I see a lightbulb going off.

 

I wanna add a siren inside the cabin..how do I add a relay so I'm not drawing too much power from that one line?

What kind of relay do I need?

I'm good at following directions..

 

no wonder my hood siren isnt as loud any more.. I added a back up siren the other day and just TAPPED the back up siren + wire into the siren wire comming out of the alarm's brain.. and as for the sound of the back up siren, it isnt as loud as when i hook it directly to the battery when i tested to see if it worked..

Questions: what kind of rely would i need? and how would i hook it up so both sirens blast to there full potential?

 

any one???

 

Bosch style relay available at Radio Shack:

85 - siren output of alarm
86 - ground
30 - fused 12v
87 - To sirens