Printer Friendly Forum Posts - wiring 2 sirens parallel?

Ok, i have the standard alarm and a piezzo alarm for my setup, I heard somewhere that to wire both, on the output from my viper 5002 (brown wire), I would need to wire in parallel.. I remember the terminology i think, and just wanted to get confirmation... Does this mean the + wire goes from the viper alarm to the positive side of the siren, then the negative wire exiting that siren will go to the positive of the piezzo siren, and the negative wire of that piezzo will go to the ground.. Does this sound about right? thanks for the help

No that's series wiring and its unlikely you will hear either. Take the brown lead to the pos (red?) on both sirens, ground the neg (black?) on both; thats para wiring.

the viper unit might not have enough current output to run two sirens. i have seen it done, but it might burn the output. you can do it the super safe way and use a relay.

85 - ground
86 - 12v siren output from unit (brown)
87 - constant 12v fused @ 5 amps
30 - to both red wire of siren

Like tedmond said I would use a relay. I know it's just a piezo your adding but i have seen DEI's siren output burn up pretty easy.

What exactly is the sense of having 2 sirens? I mean my siren isnt that loud due to the fact that I have a body kit making it harder to escape from under the car. I can hear it but its not crazy loud.

appreciate it guys, I might just do the relay to be extra safe. love this site.

to the person asking, i'm putting the piezzo siren inside the car to annoy a would be thief even more - or make his ears bleed atleast lol. thats the point. the piezo was not meant for me to hear it outside, thats the job of the main siren.

I understand that. Is there a reason to put 2 main sirens outside the car though? Also, where is a good place to mount the piezo siren? Another thing.. If you wire those 2 sirens togther, than when you arm and disarm the alarm, both sirens will sound. Is there a way to have the piezo only sound when the alarm is triggered, or a door is opened?

well some like the EXTRA loudness, but one is sufficiant and one piezo inside is WAY more enough ti kill the guy ahah. The best place to mount a piezo siren inside is under the glove box area or really high up in the dash facing the floor so it reflects more. The only way to cause one siren to go on is if your unit has the option. Most units have the HORN(-) and SIREN(+) output, and also the ouputs can sometimes be programmed. eg you can set the HORN to work when remote starting but SIREN for door trigger. i know the asianwolf doent have it, so audioman i guess your out of luck. also audioman, the siren in your engine bay, allign it so it face the floor OR face it towards the struts or chassis, this should help you gain those extra db's.

There is a way to make a delayed relay. I have seen it here on this site before. Maybe the forum Gods will shine down on us, as they always do. Simply connect the outside siren to the delayed relay and this will only chirp the peizo. It will have to see 1 solid second before the outside siren would begin to sound. I will continue looking for the diagram, it consists simply of a relay a capacitor across 85 and 86 and a resistor in series with the feed wire of the coil.

Tedmond, you said face the siren to the floor. So you mean point is downwards, which is how I have it now. Anyways, Yea I wouldnt want the piezo going off all the time. And I do know a way I can hook the peizo up. My alarm (the Asianwolf) does have an output for a horn. I can simply splice off that wire and run to the piezo. The ONLY time the horn is triggered, is when my alarm is triggered. It doesnt sound when I arm, disarm, remote start, or warn away chirps sound. So this would work then right?

Along this same topic, I have a question for the professional installers. When you install an alarm do you install a siren, or just hook up horn honk, or both? Is it a choice you give the customer or a decision you make on your own? What do you recommend? I just did my car with a scytek 5000 and I installed the just the siren st first. I didn't think the siren alone was loud enough, and thanks to assistance on this forum hooked up horn honk as well. Just wondering what the industry standard is.

audioman, well you can wire it up and see how it goes, but from what i know that unit doesnt offer programmable outputs on the siren or horn when a certain zone is triggeRED / activated.

manahawkinrob, this is really all depended on the customer. if they ask for it ill wire it in and charge him 10 bucsk for the relay. other than that i use the siren.

Thanks Tedmond. For 10 bucks more, that is a bargain!! I would gladly pay an installer an extra 10 bucks for that feature. When I went to wire mine up I went to the local car parts place and they wanted 23 bucks for a relay and a harness. Got it for 1.99 plus 4.00 shipping on ebay and had to wait 2 days.

Tedmond, I know my alarm doesnt have it programable, but my horn only sounds when the full alarm is triggered. So if I was to tie the peizo into the horn wire, then when the alarm is triggered, the siren, peizo, and horn will sound. When I arm, disarm, or remote start the car, only my under hood siren will sound.

manahawkinrob, yea my siren isnt that loud when I am and disarm the car. But when the alarm is triggered, the siren isnt too bad. But I hooked up the horn wire because everyone knows how loud a horn is.

manahawkinrob, 10 bucks is sure a steal. but hey, no point of charging much since it cost me 3 bucks for a relay and 1.00 for the harness. then wiring it/tapping and soldering it to the horn wire is at the collum anyways. so this is no biggie.

Is there a way to test the piezo siren before actually installing it? Could I simply run the power and ground wires to the battery's postive and negative?

The horn wire you are tapping into in the ignition harness is low current. It triggers a factory relay usually located in the underhood fuse box. You do not need to add a relay to the horn output of the alarm. You are wasting time and money by wiring in a relay.

Back when I installed for a living I hooked up the horn for no charge.

You also wouldn't want to trigger the piezo siren with the horn output. Most alarm "horn" outputs are going to be pulsed. You need a "constant" output to trigger the piezo or else you will only get a bunch of quick "chirps" out of the piezo which won't do much to deter a thief. If the horn output can be programmed to a constant output, then having the horn output trigger a relay that powers the piezo is the way to go.

Ok, I understand what you said. Um then how do you install these sirens? If you were to tie it with the siren under the hood, then everytime you arm, disarm, and remote start the vehicle, the piezo will sound as well. I dont want that. I only want that to sound when the alarm is actually triggered.

audioman2007 wrote:

Ok, I understand what you said. Um then how do you install these sirens? If you were to tie it with the siren under the hood, then everytime you arm, disarm, and remote start the vehicle, the piezo will sound as well. I dont want that. I only want that to sound when the alarm is actually triggered.

Depends on the system I am using.
With a DEI unit, program horn output to constant. Have it trigger a relay that powers the piezo.
With a Compustar, have the siren output trigger a relay that powers the piezos. I don't care if the piezo makes a chirping sound every time I arm/disarm. I'm outside the car when doing those functions. It won't be hurting my ears.

Can I wire something up to act as a delay. For instance if I have that something wired up and set for a 5 second delay, the relay would need a trigger for 5 seconds before it sends the trigger to the piezo. That way the only time when the piezo sounds is when the alarm is actually triggered, though having a 5 second delay.