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Old 31-12-2012, 17:03   #16
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Re: Throughull corrosion and galvanic burning on hull

Thanks everyone for your posts.
Here is what I am doing:
Conneting AC and DC grounds together.
Installing a Galvanic Isolator
Removing the Zinc that goes through my strut.
I don't have an silver chloride thing-a ma-giggee and don't feel the need to do those tests, since all my through hulls are in good shape.
I will hire a pro if after doing the above, I continue to go through zincs quickly.
That should take care of it.
I'll report back in June.
Happy New Year to all!
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Old 01-01-2013, 14:52   #17
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Good article on electrical grounding.


http://marinesurvey.com/yacht/ElectricalSystems_AC.htm
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Old 01-01-2013, 18:16   #18
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Re: Throughull corrosion and galvanic burning on hull

Quote:
Originally Posted by Onemoreproject View Post
I did some of the tests that Casey suggests in the book. I did not get a reading when I tested for stray current in the water. I did get a reading of 1.8v when I tested for AC current between the ground and neural sockets on the boat. I then tested the 30 amp socket on the dock and got the same reading
Un-plug from shore power and check for continuity between neutral and ground at your AC outlets on board. You do not want to see continuity in this instance as it means your neutral could be feeding 120AC through your AC/DC bonded ground, a potenially lethal situation for anyone in the water around your boat when connected to shore power.
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