Join Date: Aug 2008
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I believe the reason is...
The function of the isolator is to detect and use the shore-based ground via the shore power plug. This is to isolate your boat ground from the AC circuitry when a properly functioning ground is available. When the shore ground fails, you GI detects it and uses your boat ground for the AC system.
If your GI has done that, either the shore ground has failed or the GI is malfunctioning. Check the shore plug for a properly functioning ground.