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How do you wire two 12 volt car batteries to make 12 volt?

April 26, 2017batteries car Volt wire

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How do you wire two 12 volt car batteries to make 12 volt?

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You would wire them in “Parallel”. That means positive post to positive post and negative to negative. Two 12 volt batteries wired this way doubles the capacity and amperage capability of the system. It does not cause any harm to the electrical system as the system sees them as one big battery.