ISO 4165

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ISO 4165 is a standard adopted by the International Organization for Standardization (ISO). It describes a double-pole DC connector to supply between 12 and 24 V DC at up to 12 amps to appliances in vehicles. It is similar in design to a cigar lighter receptacle, but is shorter and smaller in diameter. It was originally a standard fitting on all the German military vehicles during World War II.

The current version of the standard is ISO 4165:2001^[1]

1. ↑ "ISO 4165:2001 Road vehicles -- Electrical connections -- Double-pole connection". International Organization for Standardization. 2012-04-20.