Hi UK Brit 5,
I can almost guarantee that the problem you have is not related to the Alarm at all, or the Battery,
( though the Battery may have been damaged by being constantly drained "too far" and recharged ),
and that the issue is with your Audio Software Version.
The US and Canadian export models are equipped with XM Satellite radio and a "bug"
in the first software version for the audio unit ( Version 1.04A ) intermittently caused
the Audio Unit to not shut down fully when the Ignition was switched off, causing the Battery to drain.
A software update was released that fixed this problem ( Version 1.04E ).
It's easy to check what version you have - it can be displayed on the Instrument Panel :
The Radio MUST be OFF when the Ignition is switched ON ....
Turn the Ignition ON ( but don't start the engine ) and check for "RADIO OFF" in the Display.
If the Radio is ON, then turn it OFF ( Volume all the way down to Minimum, Mute and Off ).
Switch the Ignition OFF, then back ON again and confirm that "RADIO OFF" is now displayed.
Press and hold the "P" button until the "DIAGNOSTICS" menu is displayed.
Scroll to the S/W VERSION item, and press Select.
The Latest Version for US market is 1.04E - you have anything earlier ( such as 1.04A )
then get your Dealer to update it to the latest version.
Also see this Topic as many US Dealers seem oblivious to the existence of this Update,
where to find it on their "TOL" system, or how to apply it ! :
Where Triumph dealers can find audio software updates (U.S.)As a temporary solution to prevent further Battery drain, until you can get the Software updated,
pull the Fuse for the Audio System ( Should be Fuse No.3 { 10A } in the Forward Fuse Box )
Cheers

