These are industrial power supplies's originally made for use in equipment that has +dc or/and -dc as well as a chassi/AC ground with +24vdc and +48vdc being much more common than +12vdc in automation and telecom systems. The ground (G) would be tied to "earth" ground for AC protection, and may help reduce the hum from a car electrical system
AC: ~HOT ~NEUTRAL ~GROUND (neutral & ground may be the same)
DC: Vpos Vneg "Grounding" is not always to negative, some old cars have a positive ground
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