This standard specifies the specifications and types of sockets and plugs for 12N electrical connectors between vehicles and trailers. Make electrical connectors interchangeable. This standard applies to road and urban road vehicles whose electrical system has a rated voltage of 6V or 12V.
GB/T 5053.2-1985 history
2006GB/T 5053.2-2006 Road vehicles Connectors for the electrical connection of towing and towed vehicles 7-pole connector type 12N (normal) for vehicles with 12V nominal supply voltage
1985GB/T 5053.2-1985 Electrical connections between motor vehicles and towed vehicles--Type 12N