With respect dsm I wouldn't buy another alarm without knowing if your present one is blown, else you may just blow another.
You are working with too many "unknowns".
If you take your latest alarm back to the guy that got everything working you will know if your alarm is blown or not .... if it still works then you have a known good module and can proceed from there. If it no longer works then that's tougher. Having said that, the alarm is an important item and the inputs should be protected from over-voltage, so I would hope a fuse would blow before the CC brain gets toasted.