fat_dog... I have the same iPod 160GB, and a Jan 12 car (MY 12/2011). Charges fine.
Suggest you reboot iPod (Menu and centre button hold until apple logo), and then reconnect cable to car and see.... sometimes it does not charge at first because first connection is a handshake and sometimes causes iPod to wobble (a bit like first time connecting to a PC for e.g.)
Alpine White (
) F10 520d M Sport Auto - 8 speed Auto/paddles - 350M 18" Dunlop Rear/Michelin Front RFT's - Deleted Sports Suspension