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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 center 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safety standards.▶ 2:17 Owners should verify that their isolator carries an ABYC compliance sticker and replace any outdated or non-compliant hardware to ensure proper protection.▶ 2:17

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