Chaps, my car has a factory fit alarm, now when I bought the car, the alarm did not work, but somehow last year my wife got it to work..... and worked fine until the winter then it packed up again and use to go off at all times of night randomly. now there seems to be alot of genuine fiat alarms on ebay but do you have to have the exact correct one for your car? will a grande siren fit?

if anyone can give me any clues that would be great.

thanks in advance

Robin