This is the new style plug to fit the new 13pin sockets now often fitted to modern cars. Perfect to replace the old style 7pin plugs on older trailers and caravans so it can be connected to a modern car without using an adapter. High quality, OEM standard. Made from a high impact plastic and much tougher than the old 7pin connectors. Complete with keeper (second picture) to protect plug from water ingress and corrosion when not in use. The keeper has screw holes to mount it to a trailer to service as a plug holder as well. Pins are labelled on the plug. PIN 1 (Yellow Wire) Left Hand Direction Indicator PIN 2 (Blue Wire) Rear Fog Light PIN 3 (White Wire) Common return for pins 18 PIN 4 (Green Wire) Right Hand Direction Indicator PIN 5 (Brown Wire) Right Hand Side and position lights PIN 6 (Red Wire) Stop (brake) lights PIN 7 (Black Wire) Left Hand Side and position lights PIN 8 (Pink Wire) Reversing Lights PIN 9 (Orange Wire) Continuous (Permanent) power supply PIN 10 (Grey Wire) Power Supply Controlled By Ignition Switch PIN 11 (Black/White Wire) Earth for contact 10. PIN 12 Coding for coupled trailer (Bridge pins 12 to 3 to allow the vehicle to know if a trailer is coupled. PIN 13 Common Return for contact 9.