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Jan Attenstedt and Nigel Calder discuss the risks of relying on an alternator to bridge the negative sides of mixed-voltage DC systems.0:12 A boat owner operating 12-volt and 24-volt systems reported erratic voltage readings after removing the alternator, which had been the sole connection between the two negative circuits.0:42 Calder confirms that all negative conductors in grounded DC systems must be tied together to maintain a common reference point.1:35 He advises against using the alternator as a grounding point, as this creates potential ground loops and leaves systems isolated when the alternator is removed for service.2:22 Instead, all negative busbars should connect to a central grounding busbar.2:04 This configuration ensures consistent voltage levels across different system voltages and prevents the floating potentials that caused the owner's initial measurement errors. Connecting the negative busbars directly or via a common grounding busbar provides a stable, safe electrical architecture.

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