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An AC reverse polarity light illuminating while running a generator on a mooring buoy typically indicates a grounding fault rather than a true polarity reversal.4:26 Reverse polarity occurs when hot and neutral leads are swapped, a condition that remains constant once wired and does not spontaneously develop over time.4:57 When a generator is the power source, it must maintain a secure neutral-to-ground tie to ensure both remain at the same potential.3:40 A dim light often signals a poor connection or a voltage differential between the neutral and ground wires, rather than a full polarity swap.3:08 To diagnose the issue, use an AC multimeter to measure the voltage differential between the neutral and ground at the main AC panel while the generator runs.3:29 A reading above zero suggests a failing neutral-to-ground tie within the generator or its associated wiring.3:08 If the light shines brightly, verify the integrity of all grounding connections to prevent potential electrical hazards.

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