Pin No Conductor Colour Function
Pin 1 Yellow LH Indicator
Pin 2 Blue Rear Fog Lamp
Pin 3 White Common Return (Earth)
Pin 4 Green RH Indicator
Pin 5 Brown
RH Side Tail
Pin 6 Red Brake Lights
Pin 7 Black LH Side Tail Caravan Plug as viewed from rear (cable end)

 

The 12N plug is the black one and is used for all road lights except the reversing light