ahh right, i'm just used to the old school round ones then i guess... *curses new cars LOL
on another note for future reference with max towbars here is a way to wire up the plug (direct from MAX)
1. Using a Multimeter (set on the 12v DC scale) or a test light, ensure the earth wire is properly grounded.
2. Route the trailer plug Yellow, Brown, Red and White wires to the LHS of the vehicle for connection to the LHS taillight wiring.
3. Route the trailer plug Green wire to the RHS taillight wiring.
4. Turn on the vehicle park lights and using the tester determine the live wire feeding the park lights. Connect this to rhe Brown trailer plug wire using a white 'scotch
lock' provided.
5. Using the same method, identify the LHS turn signal, the RHS signal and the stop light. Connect them respectively to the Yellow, Green and Red wires or the trailer
plug.
6. Connect the vehicle earth wire (usually black) to the White wire of the trailer plug.
In summary, the trailer plug colour code is:
Yellow - Left Hand Signal
Green - Right Hand Signal
Brown - Tail Light
Red - Stop Light
White - Earth
cheers