This standard specifies the specifications and types of sockets and plugs for 24N electrical connectors between vehicles and trailers. Make electrical connectors interchangeable. This standard applies to road and urban road vehicles with a rated voltage of the electrical system of 24V.
GB/T 5053.1-1985 history
2006GB/T 5053.1-2006 Road vehicles.Connectors for the electrical connection of towing and towed vehicles-7-pole connector type 24 N(normal)for vehicles with 24V nominal supply voltage
1985GB/T 5053.1-1985 Electrical connections between motor vehicles and towed vehicles--Type 24N