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I am a liveaboard. But this doesn't explain the difference in zinc loss between now and the previous 2 years. There is a home-built aluminium hull ketch that moved in about 6 months ago. The marina, Marina Landing Marina is across from Moody Gardens in a side area of Offuts Bayou in Galveston. The electrical wiring to the docks runs underneath the dock and is "enclosed" in white poly plumbing tubing. It is frequently underwater at very high tides and the Marina cuts electrical power in extreme weather. As an aside. I have had to replace my window ac units three times in the last 2 years as they cease to cool after short times of usage. There are frequent complaints of loss of electrical power and many boats seeking dockage are turned away because the slips have no electical power. Given all this and the fact that my 29d batteries are now dead as doornails, narrowing the cause to the Marina or my boat or both is tricky! Therefore, ascertaining the presence of stray current and the source is the first step.
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