First sorry about my English

i just installed in my car a metasat system ( metasat is a unit with car kit with its own phone and a GPS antenna)

you can control the whole system with your personal cellphone.
with a SMS you know anytime where ur car is
its very nice and in case that someone steel ur car uou can find him in 5 minutes
also you can hear from your cellphone anything that happens inside the car without anyone noticed that you spy them

Also when the car alarm is activated a SMS is comming in yr phone


The system sends you with SMS any changes in the battery volts
(sorry...my english is not good enough to explain what exactly i mean by that

Now i come with the problem

i couldnt get signal from the car alarm in order to activate
the metasat system. The 3 wires that comes to the siren in the rear right trunk dont give any electricity to activate the system.
So i broke the siren and i get electricity direct from the spool.

i dont thing this is the best way to do it....so i ask you if anyone knows or have a good idea how can i get a (+) or a (-) stream even in very low voltage to get a signal when the alarm is activated


thnx very much and again sorry for my English