If two 12 V batteries are fitted to a truck with a 12-volt electrical system while keeping that operating voltage, how must their terminals be connected?

Question

DentroTest · Accepted Answer

To keep the same nominal voltage of 12 volts while doubling the storage capacity and the available current (ampere-hours), the batteries must be connected in parallel. A parallel connection is made by joining the positive (+) terminal of one battery to the positive (+) terminal of the other, and the negative (-) terminal of one to the negative (-) terminal of the other. If they were connected in series (positive to negative), the resulting voltage would be 24 V, which would damage an installation designed for 12 V. Joining only the negative terminals to each other is an incomplete, useless connection, and taking one positive terminal to ground and connecting the negative to the supply would reverse the usual polarity and cause a short circuit or a malfunction.

If two 12 V batteries are fitted to a truck with a 12-volt electrical system while keeping that operating voltage, how must their terminals be connected?

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