Skoda superb elegance 2.0 TDi DSG
My battery went flat around 12 months ago, it was old so I got a new one, before i did i checked what the alternator was producing and it was very low, but once revved over 1500rpm it kicked into full charge. If i remember correctly, it only had to go above 1500 once and the alternator kicked in and continued to even when idling at 900.
I told a garage about this in an MOT and they still left lights on and flattened my new battery. I managed to get a new one under warranty but it's gone flat with the cold and not using it often enough. I was in it 7 days ago for a long run out but it's dead now and on charge with an optimate.
I once seen on here about a gearbox overrun cable that can cause this but no more info?