If a vehicle has two 12-volt batteries and the starter motor requires 24 volts to operate, how must they be connected to each other?

Question

DentroTest · Accepted Answer

To raise the electrical voltage and reach the 24 V required by the starter motor from two 12 V sources, a series connection is necessary. This configuration is achieved by joining the positive (+) terminal of one battery to the negative (-) terminal of the other; in this way, the voltages add up (12 V 12 V = 24 V) while the total capacity (Ah) remains constant. Connecting terminals of the same polarity (positive to positive or negative to negative) would form a parallel circuit, which would add up the capacity but keep the voltage unchanged at 12 V, which is insufficient to operate the starter.

If a vehicle has two 12-volt batteries and the starter motor requires 24 volts to operate, how must they be connected to each other?

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