We got to Liverpool docks without incident. The boat is an over night ferry and arrives into Belfast at 6.30am. Upon arrival into Belfast we started up the engine, and the bloody battery warning light buzzed on again! I was gutted, clearly the battery is draining, and any plans for long road trips this summer in the S3 won't be happening. I just don't trust it anymore! Luckily I live only 20 minutes from the docks and the warning light went away after 10 seconds or so......
Chris, on re-reading this I think your problem is the battery not the alternator. If the charge light goes out then the alternator should be generating a current. So it sounds as if the battery is discharging and either it's faulty (most likely) or there is a leakage in the car's system. Any decent garage should have a battery tester which will quickly determine if it's the battery.
