I still have the factory ford alarm in it.At random times usually when the isnt warmed up the alarm works fine except there is no sound coming from the alarms siren.I cant remember if the cars horn part of it works or not.Usually after the car has warmed up all is good.Any ideas?Suggestions?I have 2 brand new sirens still in the box and I have tried both of them and that isnt the problem,the alarms brain going bad?If so what would be a descent replacement without having to do alot of rewireing,I used to install them years ago.