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Possible electrical/corrision problem

Old 11-12-2016, 07:36 AM
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Default Possible electrical/corrision problem

Hauled the boat last w/e and noticed significant deterioration of all zincs. Boat is 06 Wellcraft 290 Coastal with 2 yamaha F250. 1house/starboard battery, 1 port battery, 1 genny battery.
Both bracket zincs worn significantly and 3 of 4 stainless screws heads gone on each. Trim tab zincs worn as well.

Boat in water engines up batteries off when not in use.
Boat is new to me Aug. 2015 all zincs replaced at start of 2016 season. The old ones were not that bad when removed.
All mounting surfaces cleaned when installed, lower units were anti fouled before zincs installed.
Not sure if it is my boat or neighbors, where to start diagnosing the problem?
Old 11-12-2016, 08:02 AM
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If you are using shore power the first line of defense is a Galvanic Isolator. It provides major protection from dirty ground wire docks, mis-wired boats, industrial ground currents etc. At about $100 it is an investment that can pay for itself in a year with zinc savings.
Old 11-12-2016, 04:05 PM
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Originally Posted by yandina View Post
If you are using shore power the first line of defense is a Galvanic Isolator. It provides major protection from dirty ground wire docks, mis-wired boats, industrial ground currents etc. At about $100 it is an investment that can pay for itself in a year with zinc savings.
This is very good advice. We have seen extreme issued at one of the marinas we frequent. The cause were the electrical pedestals themselves. The marina contracted with a marine electrician specialist (did not know there was such a thing) and they rewired the boxes and that solved the issue. This was an extreme case as shafts on larger boats were severely damaged.

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