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.)
Bluestone G30 ///
M Sport Auto (Current)
Alpine White F10 M Sport | 8 speed Sport Auto - Gone to Stud