How do I install a 2nd siren?

Ahhhh, nothing like the process of peer review to get to the bottom of things 

Well, I'm going to try just hooking it up parallel first without any relays,,,,,, unless,,, anyone has any more afterthoughts 

Reep

I'll take your wise advise "Wirewise".

But here is one more idea.  How about I just splice into my horn instead.  It might not sound as pretty, but who cares.  The only problem is if I don't use a relay, my alrm may sound off every time I honk my horn,,,,unless,,,,,I use a diode.

Hmmmm, or maybe I should just leave the wiring to the profesionals  

Reep

Well the whole idea is just to make some noise outside of the car.  It would be easier to use the horn (no mounting, and the wiring is already in place) and cheaper: I would have to purchase the siren and relay online ($20.00 with shipping/handling).

Reep

you should have a siren outside to attract attention.  I have 5 sirens in total on my car now.  I have 1 hidden in the front of the car and 1 hidden towards the rear bumper.  The other three sirens are in my vents, they are mini piezo sirens (pain generators).  I would definetly use a relay.  If you wire up 2 normal size sirens in parallel you risk blowing the siren output of your alarm.  There's no fuse there unless you add one.  With a relay you could probably add 20 sirens with no problem.  Be safe and add a relay.

You are only as good as your worst install!!

5 sirens in your car sounds like overkill.  Do they all have seperate power supplies?  Because, all a thief has to do is pop the hood and yank the battery cable to dissable all the sirens you put in.  And if it's too loud, a car thief can actually sue you for damaging his eardrums - this happened in California.

Well, I tried to hook my horn up along with my interior siren.  It didn't work.  The horn made a little whimpering noise, and the siren sounded at half volume.  So I guess I'll go with the relay and siren.

Also, I'm relocating my hood release to prevent the situation I first mentioned.  Just call me parinoid. (and I have a cheap car, too :)

Reepicheep

Hi Bud

It all depends how you mount the piezo sirens.  My piezo sirens come through the internal ducts.  I had to cut a rectangular hole the size of the piezo so that it just barely enters the vent ducts on the inside.  I then sealed the area around the piezo.  It keeps the airflow flowing at its max.  If your adding 1 piezo then you don't need a relay.  The piezo uses about 1/ 3 the power of a normal siren.  About the DEI siren, are you thinking about having that one inside?  If you add that one you will have to have a relay.  The siren output is made really for only one (normal size) siren.  It's good to add a relay cause if down the road you want to add more sirens you can.  If you need any help with any of the siren set-up's just ask, I'll try to get back to you as soon as possible.

hot_shot_guy123