What's the best way to ground two sets of twelve volt marine batteries used to power a 16 ft. pontoon boat. Each set consists of two batteries connected in series to separately power two 24 volt motors. It was suggested that I connect a wire from the negative output terminal of each battery set to the steel motor mounts. Is this the correct way to ground the batteries? Also what would happen if I did not ground the batteries? Please note that the boat has a dual system to start and control both motors.
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