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Older diode-based battery isolators cause a 0.7-volt drop in charging current, which often prevents electronics battery banks from reaching a full charge.1:37 This voltage loss, combined with typical line resistance and low alternator output at idle, can result in a net-negative charge state when high-draw equipment like chart plotters, radar, or pot pullers are active.5:09 Diode isolators are identifiable by the large heat sinks required to dissipate the energy lost as heat.1:03 Replacing these units with modern FET-based (Field Effect Transistor) isolators significantly improves charging efficiency by minimizing voltage drop.3:21 Jeff Cote recommends installing a battery monitor to track real-time current flow and verify that alternator output exceeds total vessel loads, especially during low-RPM operation.6:00 Replacing inefficient diode-based isolators with FET-based models ensures more alternator power reaches the battery banks.3:45

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