zinc replacement
I just had the hull cleaned, thru-hulls checked, prop cleaned and zincs replaced. The zincs had been replaced the 1st of April this year with three donut zincs on my 1-1/4 inch diameter shaft. They were almost falling off after only a little over three months. The previous egg type zinc (one) had lasted almost two years but at a different marina for one of those years. The three new large egg zincs were recommended by both the diver and several dock mates. As a matter of fact, one of these said he has a large commercial zinc suspended by a cable and grounded to his engine in addition to his shaft zincs, (he has a note on his ignition key to this effect). I believe that there must be some major electrical currents in the water to cause this zinc problem. I have a Fluke multimeter but don't know how to test the water for stray current. If I can test and find electrical current in the water, what would be my best solutions?
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