I have always installed two [2] shaft zincs, at the beginning of sailing season.
For last two seasons, I've seen their deterioration accelerate in my marina, despite having a galvanic isolator on board. I know I need to find the stray current source. That said, any thoughts on adding a third zinc as a measure of "insurance"? thanks, Pete W. Siren Song C&C30mkII Deltaville, Va.
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