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Porsche Negative Ground 6V to 12V Converter - All 356s 50-65 SMC-230-367 644-109-380-00 Cabriolet models use a blackPorsche Negative ground converter for 6V to 12V. For all 356's, years 1950 1965. Will operate 12 volt negative ground accessories from 6 or 8 volt negative ground electrical systems. The maximum output power is a function of input voltage. When used in a 6 volt system, it can continuously supply more than 3. 5 amps with the engine off, and about 5 amps with the engine running at a fast idle.