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A 2003 American-built boat exhibits a six-to-seven-volt neutral-to-ground voltage drop and a 15% line voltage loss under a 15-amp load.0:27 These symptoms suggest a high-resistance connection rather than a systemic wiring failure. Nigel Calder advises against dismantling the boat’s electrical system, noting that such invasive measures often obscure the root cause.1:40 Instead, systematic testing with a multimeter can isolate the fault location.1:46 The most likely culprit in a 120-volt split-phase shore power system is a poor connection within the shore power circuit, such as a loose neutral terminal.2:43 Troubleshooting should focus on identifying these high-resistance points through voltage drop testing at various connection points before considering major rewiring.2:14 Proper diagnostic testing typically reveals the fault without requiring extensive demolition of the vessel's interior.2:05

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