ISO 3732:2003 PDF

Scope: This International Standard specifies the dimensions of, and requirements for, 7-pole connectors of type 12 S and their contact allocation for the electrical connection of towing (passenger cars or light commercial vehicles) and towed vehicles with 12 V nominal supply voltage, thus ensuring interchangeability. A 12 S connector is intended to be used in addition to a 12 N connector according to ISO 1724 where more than 7 poles are required. NOTE For new developments and where more than 7 poles are required, as an alternative to the use of the 7-pole connector according to this International Standard and ISO 1724, the use of 13-pole connector in accordance with ISO 11446 may be required.

ISO 3732:2003 Referenced Document

ISO 1103 Road vehicles - Coupling balls for caravans and light trailers - Dimensions*， 2007-06-01 Update
ISO 1724 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - 7-pole connector type 12 N (normal) for vehicles with 12 V nominal supply voltage
ISO 4091:2003 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - Definitions, tests and requirements

2003 ISO 3732:2003 Road vehicles - Connectors for the electrical connection of towing and towed vehicles - 7-pole connector type 12 S (supplementary) for vehicles with 12 V nominal supply voltage
1997 ISO 3732:1997 Road vehicles - Electrical connections between towing and towed vehicles with 12 V systems - 7 pole connector type 12 S (supplementary)
1982 ISO 3732:1982 Road vehicles; Electrical connections between towing vehicles and trailers with 6 or 12 V electrical equipment; Type 12 S (supplementary)
1976 ISO 3732:1976 Title missing - Legacy paper document