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Old 10-02-2013, 03:57 PM   #1
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DinghyDog's Avatar
City: Annapolis
Country: US
Vessel Model: Pacific Trawler 37
Join Date: Sep 2012
Posts: 36
Extensive Zinc Corrosion caused by Fish Finder

Purchased my PT last December and cruised her back to Annapolis from Norfolk (had unseasonably good weather for Dec). Between the time of the survey in Norfolk and being hauled for winter back in Annapolis, I noticed significant corrosion of the all zincs during what was essentially a week long cruise.

I replaced all zincs before Spring launch and purchased a reference electrode to investigate the cause. Tuned out to be the installed Furuno fish finder. I have not used the fish finder all season because I can't seem to isolate the problem and my zincs have shown normal corrosion. Anyone had a similar problem?


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Old 10-05-2013, 04:22 PM   #2
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Larry M's Avatar
City: Friday Harbor, WA
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 4,409
How do you know it was the fish finder? Was it wired incorrectly?

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Old 10-05-2013, 04:31 PM   #3
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City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 12,769
sounds like a stray current corrosion issue internal to the ducer....especially that it was that quick and you isolated it to what I gather is a bronze thru hull ducer?
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