BoatHowTo · video

What this video covers

Galvanic isolators prevent underwater metal corrosion caused by stray current when a boat connects to shore power. The necessity for an isolator depends on the presence of an AC shore power system rather than the boat type, such as a centre console or sailboat.0:39 When a vessel plugs into shore power, the grounding conductor creates an electrical loop between the boat, the dock, and other connected vessels, effectively forming a battery that accelerates the degradation of underwater components.1:07 An isolator breaks this circuit, provided the system lacks an isolation transformer.1:36 Install the device immediately after the shore power inlet on the hull, specifically within the grounding conductor.2:03 Older units, often identified by small, finned housings, frequently fail in a shorted position and lack modern safety standards.2:17 Owners should verify that their isolator carries an ABYC compliance sticker and replace any outdated or non-compliant hardware to ensure proper protection.2:17

More from BoatHowTo

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

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