I'm having a problem with my META alarm, suprise suprise!

Since my engine rebuild when I arm the alarm the central locking works and the the indicators flash 3 times as usual. But after 2 minutes of it being sat there the siren goes off but with no lights.

Any help would be great!

http://www.metasystem.co.uk/index.php/msy_eng_en/content/view/full/197

Just might be something there.

Try (a) disconnecting the battery for a few hours, (b) cancelling the alarm memory (as per instructions above) and then (c) resort to disconnecting the siren.