Hi, bought a VF evoke sportwagon (2014) a couple of weeks ago, it's an ex-fleet (rms), 18 months old and has 99,000km. Drove it back to Sydney from the dealer in Albury and that night the radio stations reset. Didn't think anything of it until three days later the car displays 'check battery charging system' as battery voltage was low and it went into power saving mode. Took it to Holden dealer for warranty fix and was told to get a new battery. Got a new battery and three days later, my voltage is showing 12.3 again. Take it back to service centre and told the terminals were just dirty. It's been three days again and I have watched the voltage drop from 14.5 to 12.6 while driving along. Is there such thing as an intermittent alternator fault that would cause this? Is the Holden service centre fobbing me off until the 100,000km is reached?? Any advice or is it ok to sit at 12.6v?