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 Catalina 25 Specific Forum
 Grounding Seacocks		  New Topic  Topic Locked
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Bortiquai
1st Mate

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88 Posts
Initially Posted - 12/31/2008 :  10:31:51  Show Profile
I know there are several different theories about grounding in a DC environment.


But what about the seacocks and other thru-hulls? I replaced one seacock about 10 months ago, and it is already showing a little bit of green. A friend said I should just run a wire from the screw on the seacock to the negative bus bar of my DC electrical system.

Is this a good idea? Will it help?

Thanks
Matt
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 12/31/2008 :  12:05:49  Show Profile  Visit JimB517's Homepage
No, don't do it. The seacocks and all underwater metal on a bigger boat are wired together but the wire goes to the bonding system (ie a zinc) not to the electrical system. Boat 12 volt system float and do not have a chassis ground. The Catalina 25 does not have a bonding system but you could create one if it was really important to you. With an outboard stored out of the water I don't think you really need it.
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Happy D
Admiral

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921 Posts
Response Posted - 12/31/2008 :  13:03:56  Show Profile
If the sea cock is totally isolated from eveything else and only has a rubber hose connected to it, stray current cannot go through it. It is just a piece of bronze sitting in the water. I agree with Jim 100%, don't do it.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 12/31/2008 :  17:05:51  Show Profile
A little green is probably oxidation, galvanic corrosion on bronze usually turns it pinkish. Don't do it is probably the universal position here. Power boats can be different.
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Bortiquai
1st Mate

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88 Posts
Response Posted - 12/31/2008 :  20:21:53  Show Profile
Awesome. Glad I asked. Thanks to all who chimed in for the advice.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.