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How do you wire a second battery in a 1997 Sierra?

Updated: 8/17/2019
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15y ago

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Find a position for the battery then connect them together in parallel that is negative to negative positive to positive. That way you will still have 12 volts with larger capacity. Don't connect them in series that is positive to negative because you will end up with 24 Volts.

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Q: How do you wire a second battery in a 1997 Sierra?
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