Hey does the stock alarm have a battery backup (don't think so) and if not, is there a way to give it one?

 

No, it doesn't. Theoretically it's possible, but you'd need to use a rechargeable battery with a circuit to keep it charged while isolating it so it doesn't try to power anything other than the alarm. Aftermarket alarms with backup batteries have this built in.

 

DEI sells a backup siren with a builtin, self-recharging backup battery. I've been thinking of getting one.

http://www.caraudio-caralarms.com/515R.html

I don't know for a fact, but I figure it works by triggering off the actual alarm horn circuit and runs straight from battery power until that power is cut. Since its not on alarm-only power it can recharge from the battery as needed


jason

 

Wow! Just found them on eBay for $30 + $10 shipping!

http://cgi.ebay.com/ws/eBayISAPI.dll...category=14934

jason

[edit] p.s. just bought one

 

Ebay link NG?
I don't think that siren will work on the factory alarm since the horn output is pulsed rather than constant. The alarm does not have a "grounded when triggered" output to drive a standard siren.

 

Unless you are assuming I'm replacing the stock security horn with this backup siren, it makes no difference. As the security horn power chirps, the backup alarm will chirp. But when battery power to the backup siren is cut, it switches to internal backup battery and will blare continously.

Sounds like a good system to me.

jason

 

Oh btw, eBay admins canned the auction because DEI, appearantly, is cranky about people selling there products in such a way that does not provide professional install. How stupid. Well I wont get eBay feedback for it, but I'm still getting the item

jason

 

Ok, well as long as you don't mind that the siren will operate that way, it will serve it's purpose. If you wanted or expected it to sound like a regular siren when the alarm is powered normally, that's another story.