On Tue, 8/30/16, sailw32@aol.com [amelyachtowners] <amelyachtowners@yahoogroups.com> wrote:

Subject: [Amel Yacht Owners] Degraded continuity
To: amelyachtowners@yahoogroups.com
Date: Tuesday, August 30, 2016, 7:51 AM


 









Before my boat went into back into the
water yesterday , I checked for continuity between the
copper strap and the zincs and I did have continuity. Later
, I had two marine electricians on the boat and they checked
the potential from the quadrant and found it to be only 560
, they tell me that they would expect to see about 900. 900
would insure that the zincs are protecting the metal parts
of the boat. We can only speculate that the connection
between the quadrant wire and the zincs have been degraded .
There may not be enough contact between the zinc bolt and
the strap inside  the rudder , it would only be the
threaded area of the bolt and the strap , and stainless is
not the best metal as a conductor . Bottom line is that I
need more zinc protection/contact. They suggested that we
install a large zinc on the hull with two bronze bolts (
better conductivity )through the hull , wired directly to
the strap in the bilge. I am writing this to inform the
group , that just because you have continuity , does not
mean that you have adequate contact/protection.
Pat SM123












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