Hello Folks. When I took her out this past week (the boat...not the admiral!) there were circular 'stains' surrounding any thru-hull fittings. It is my understanding that this indicates a level of galvanic corrosion and poor grounding. I employ the use of zinc anodes on the shafts, trim tabs, each of the engines and there is a stern 'block' of zinc. Last season I gave the latter a good tightening. Question: Is there a 'sure-fire' way to determine if the 'green' bonding wires inside the boat are actually doing their job? Those wires are attached to all thru-hull components as well as the engines. I believe that they terminate aft at the zinc block. A guy at the yard said my boat was the worst of the lot and he tells me there is definitely a grounding issue with the boat. What say you? Thanks.