Datatool System 3 Alarm Problem
 

In the summer my alarm went off while I was riding the bike, so I stopped disarmed it. WHen I tried to start the bike the starter motor wouldn't turn. I can only get the bike started by disconnectiong the lead on starter. Also the alarm won't go in the service mode. I've disconnected the battery on the bike and left it for a while i.e.couple of days, reconnected everything but it is still behaving the same anyone got any ideas of what might be wrong?

mine behaved like that when the positive wire to the alarm coroded and broke

If you can disconnect the battery without the alarm going off when not in service mode, then the internal battery is dead ............ at least. It sounds like the relay that cuts the starter circuit has gone to??
Glyn's idea is very valid as this would prevent the internal battery from charging and the alarm from sensing voltage drop. Having no power would render it null and void and may have failed safe on the starter circuit.
Check the wire and also the fuse first.

When I disconnected the main battery the alarm did go off for a while then it stopped.

Then the power connection is probably good. It's just the internal battery that is a bit tired.
You've probably got a problem with the circuit board.

Ok thanks thought that might be the case.

The best modification I made to my 748 was to spend a couple of hours cutting out the Datatool system 3 and throwing it as far as I could.

Hey presto, no bike not starting, no alarm going off the in the garage no alarm going off when riding down the road......

Buy a big lock!

Same here... I had a big problem with my indicator wires blowing the fuse for the stop and horn, so my bike wouldn't start and the alarm would go off whilst riding it (had to push start it). Then the alarm "apparently" was the cause of my ECu going caput, which left me with a nice bill for a new one whilst out in France.

PS - try not to break down in Poitiers - its a very boring place if youre forced to stay there!

Right i'm going to remove the alarm but there is one connector on the left had side which comes out of the main wiring of the bike and connects to a lead from the alarm but there doesn't to another connect to connect to it, do I just unconnect this one and tape it up. this wire is not the indicator, or the battery or led or the other lead that connects by the clutch cover.

Yes just tape it up, did the same to mine this year, and it runs fine.