I thought I'd have a nice easy job in replacing the broken radio with a shiny new one, but I've run up against a slight problem. The plug at the back has six (well, seven actually) wires coming from the back plus the black earth wire which is separate, but I'm not sure what they do and the manuals only list two. So can anyone tell me what they do: On the plug, from the left: Top Blue Brown Grey Bottom Yellow/Red Red/Black(2 wires) Red I think the Yellow/Red is the main feed wire but am not sure what the rest do... Help!!