Hi new member the battery light on my 2008 crv 2.2 diesel comes on when driving( this is not on all the time some times on some times off) then goes out when car idles have checked and getting 14,2 volts when engine running and 12,9 volts when off getting an occasional chattering which could be the bottom crank pulley? any one any help and advice on this also if it is the pulley do l have to buy the genuine honda pulley