Features: 1.7?pin connector, used to establish a secure connection between tractor and trailer. 2.Pure copper contact with good conductivity, fast connection, reliable and easy to use. 3.Anti?corrosion plastic socket, and the anti?seismic internal design can eliminate short circuit. 4.Standard European trailer connector, widely used in commercial vehicles, semi trailers, trailers. 5.Compact size, lightweight and portable, easy to carry, bring much convenience for you. Specification: Condition: Brand New Item Type: Trailer Connector Material: ABS + Copper Color: Black Cable Length: Approx. 1.5m/4.9ft Main Function: Connect truck and power supply, suitable for trailer signal light display Scope of Application: Trailer connector Type: Socket Shape: Round Wiring Configuration: 7 Pin Lighting Connections - 12 N Black Cable Function PIN 1 - Yellow Wire (Left/H Direction Indicator) PIN 2 - Blue Wire ( Rear Fog Lamps ) PIN 3 - White Wire ( Earth Return ) PIN 4 - Green Wire (Right/H Direction Indicator) PIN 5 - Brown Wire (Right/H Tail & No. Plate Lamp ) PIN 6 - Red Wire (Stop Lamps ) PIN 7 - Black Wire (Left/H Tail & No. Plate Lamp ) Caravan 7 pin supplementary circuits 12S grey cable function Pin 1 Yellow Reversing Lamps Pin 2 Blue Battery Charging (original UK system) Pin 3 White Earth Return (for pins 2&4) Pin 4 Green Power Supply Pin 5 Brown Spare Pin 6 Red Fridge Pin 7 Black Earth Return (for pin 6)