1996 Chrysler Cirrus

My 1996 chyrsler cirius has an alarm going off on it ever time I start the car the alarm cuts the car back off and it is some how draining the battery. I have to keep getting a jump than start the car the alarm kicks in and the car cuts off. The thing is I don't know where the alarm is coming from. Can you please help me. Thank you
January 6, 2011.

I have to be honest, it must have an aftermarket alarm system. Because of that, I won't have schematics or electrical information on it.