BoatHowTo · video

What this video covers

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

More from BoatHowTo

Grounding on Aluminium Yachts 🔧 | Ask The Expert with NIGEL CALDERSep 2026Boat ELECTRIC PROPULSION with only LEAD ACID Batteries ?? | Ask The Expert with NIGEL CALDERSep 2026MaxProp: More Pitch in Reverse than in Forward? 🤔 | Ask The Expert with NIGEL CALDERSep 2026Common Ground Point with Isolated Saildrives | Ask The Expert with NIGEL CALDERSep 2026

From BoatHowTo — see the channel’s boat, crew, and every analyzed video.

The Sailing Directory Newsletter

One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.