I've got an A3 TDi170 which has been suffering from flat batteries.
On Saturday started it in the morning and it started fine. Drove it to several places all fine. Went to supermarket, was in supermarket for 10 minutes, came out and car wouldn't start. RAC man said it was battery, tested the battery and it was flat. He jumped it and it started perfectly. He tested the alternator and the drain on the battery (when engine off) and both were within normal levels. He couldn't really advise me what to do, he said specifically that the battery was healthy and it would be a waste to buy a new one.
Yesterday same thing happened. Drove it fine in the morning to work. Drove it to the in-laws. Got out of car, picked up kids, got in car and wouldn't start. I jumped it myself this time off the in-laws van and again a healthy start.
What do I do? If there is no drain, the battery is healthy and the alternator is charging correctly i'm stumped.
The side repeater is broken. Could this potentially cause a problem? i/e water getting in etc? I'm sceptical because it wasn't raining on either day but it's the only thing i can think.
Any help would be greatly appreciated!!