Never know where to post alarm problems

so here goes
The last couple of days the big LED light on my concept 50 has been playing up.
If you know this alarm, when deactivated the led is of and when it is active it flashes, but the led has come constant on when i am driving and when activated it flashes and goes from bright to a dim light, instead of bright to off and on again.
anyone got any ideas on this?