Electric Trailer Wiring Diagram. The second wire green to originate from the connector is responsible for the right signal. White pin for the ground.
Adaptor for 13 pin vehicle to 7 pin trailer. Auxiliary connection is optional it may be connected to any 12v to 24v constant power source or left unconnected. The third brown wire is the one that is responsible for the taillights.
A lot of led lights come with black and white wires and people can easily confuse the black wire for the ground.
Some previous versions of it were titled wiring a vehicle for trailer towing. The diagrams below show the typical trailer wiring for 4 pin flat connectors all the way to 7 pin round connectors. 01392 216336 shop at westerntowingcouk. It should not be carrying heavy loads through the journey.