multiple sirens need relays?

i have a car that a friend wants 4 sirens hooked up to. two under the hood, and two in the car. should i use relays to wire these up, and if so, would anyone have a diagram i coulg use as a guideline?blatant3

If the sirens total current draw is too much for the alarm (most probably is) you will need a relay or two. Extra relays won't harm but too few will. You will have to connect the siren output to the relay coil and connect the relay switch output to the sirens.   But first, make sure you're staying withing the legal stipulated db level or the cops might slap you with a fine or more, I am not too sure.

Yea with more than one relay you will need a relay or it will make two sirens sound quiter than one.~The Rookie~

Rookie of the year that is...

Don't let the smoke out of your equiptment..it doesn't go back in.

Im just curious but why does your friend want 4 sirens, and that too 2 in the car. I would think the ones under the hood are the ones "outside" the car and their sound would travel furthur than the ones "inside" the car. Or is there something else I am missing?

Teamrf wrote: Yea with more than one relay you will need a relay or it will make two sirens sound quiter than one.

I think he meant more then two sirens. Also, the siren's volume will not neccesarilly diminish with sound if you use two sirens off of the alarm's output, it wouldn't even be noticable if at all. Depending on the siren, you can run up to sixty sirens off of 1 relay. So all you will need is one relay. Interior sirens are used to annoy thieves rather then alert people.Certified Security Specialist

Always check info with a digital multimeter.

I promise to be good.

Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

A few days ago, this pick up truck was trying to park between two cars and bumped into my car in which I installed a dual zone alarm, remote-start etc etc so my alarm went off upon getting bumped. I was outside and talked with the guy. He said I should not have my alarm go off so easily and threatened me by saying that people will scratch my car with keys if my alarm goes off so easily. I then wondered if HE would be the one to do such things but just stayed cool and let him go. He said that thieves dont care about alarms at all. Is that true?

For the most part, no, I don't think true thieves care about alarms. After installing for 7 years, there are very few vehicles I feel that I cannot hotwire and no alarm that I cannot get around in less then a minute. You need to know how thieve steal the vehicles to be able to truly protect them.Certified Security Specialist

Always check info with a digital multimeter.

I promise to be good.

Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

That's true. I guess making sure a thief cannot cut off the power to your alarm is one of the most important factors in order to thwart a car-thief in his(or her) efforts to bypass an alarm, so I would think that keeping a hidden secondary battery that powers the alarm would be something I would think is important; is that right?. Also hiding the alarm brain in the most difficult location would be my second guess as to making the thief's attempt futile or very difficult at least, during which hopefully someone calls gentlemen with handcuffs. If there are more measures to keep thieves at bay, I would like to know and am sure others will benefit from it as well.

There are, they're just not legal. :d. Seat warmers.....pshhhh. How about hooking those up to the ignition coil.

blackshuck wrote: There are, they're just not legal. :d. Seat warmers.....pshhhh. How about hooking those up to the ignition coil.

I will leave this as just, shut up or leave.Certified Security Specialist

Always check info with a digital multimeter.

I promise to be good.

Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.