hi teabag,
the steps of events are as follows.
1. original battery was giving up on me as it was approx 5 years old. Hard dying start.
2. went to battery shop to buy new battery
3. removed old battery
4. fitted new battery. Connected the negative and then as th ethe positive terminal was connected, the sounder started and would not stop until the battery was again disconnected.
5. Eventually removed the sounder plug and drove home.
6. As soon as i attempt to reconnect the sounder plug it starts going offf again.
With regard to re syncing the fob, no, i did not. No clue as to how its done.
Thx Teabag. will await some advice.