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A QUICK CHECK OF YOUR GALVANIC ISOLATOR.
Thanks for the comments, Ann-Marie.
Andina Marie wrote: Chuck, in over 20 years working on boats I've never encountered a boat in the water on shore power that had zero volts across the Galvanic Isolator. Just the zincs on your underwater metal will introduce about 0.5 volts DC. I don't see how the zincs on your boat can cause a current to flow through your GI (and thus the shore power ground). In the common case of a bronze prop and a zinc on the shaft, for example, the galvanic current passes through the shaft. It does not pass through the GI. A neighboring boat using the shore power ground to complete a galvanic circuit with your zinc would definitely cause a current to flow in the GI. Even if the neighboring boat was protected with its own zinc, there could still be a small galvanic couple created with your zinc, especially in sal****er. Not nearly as likely in fresh water. Other than that, I would have a difficult time explaining the voltages you measure. Chuck |
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