Hi, csn anybody help me I have a volvo s40 2008 diesel and the battery light is on and also power service requite message on dashboard. I have checked the battery and it sits at 12.65v and is charging at 14.7v also. The three wires on the plug have 12v on the red wires and 3.4v between the other two I think that this is all OK. Any help or advice would be appreciated.