Chris,
I've never seen a prop shaft grounded like that! I'm guessing it was
someones amateur attempt to solve a problem that was unsuccessful. Is the
boat connected to shore power? Often the problem is a difference in
potential between the ground wire coming from the dock and the water you're
sitting in. Milivolts are all you need to cause a problem. I would
install a ground isolator between the green wire coming from the dock and
your boats ground system if you use shore power. I'm on shore power and my
zincs last all season.
Gary
S/V Kaylarah
'90 C&C 37+
East Greenwich, RI, USA
~~~~~~~_/)~~~~~~
On Fri, Sep 28, 2018 at 6:09 PM Chris Hobson via CnC-List <
cnc-list@cnc-list.com> wrote:
> I seem to replace zincs more than usual, perhaps a symptom of my Marina
> and the proximity to tug boats who drop barges of gravel off on the other
> side of the creek. Anyway I was snooping around the engine and discovered
> that the other end of (what appears to be a ground) wire running from a
> steel tang resting on the prop shaft to a corroded wire that goes nowhere.
> Does anyone have other ideas about what this metal piece on the shaft is
> used for, and it it was intended to ground the prop shaft to prevent my
> zinc habit.
>
> Here’s a photo:
> https://drive.google.com/file/d/1EqgjP3GIU0TPHkF2BPOT3bVz4QoDBiI0/view?usp=sharing
>
> Thanks!
>
> Chris Hobson
> S/V Going
> 1980 C&C MKI
> Hull 615
>
>
>
>
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