Civic 2007 Battery Change - Alarm going off

[Kingdom35]

Hi All

I changed the battery in my Civic and then connected it, but now my alarm is going off whenever I connect the battery.

My keyfob battery is dead and has been for years (I know I should change it and will), but any ideas of what to do?

Tried locking the car, connecting and the alarm goes off, same again when unlocking the car.

At the end of my tether as to what to do ;-/

[kurt535]

long shot...could it be the rectifier?