356 zinc problems
Hi John, we're hull number 198! we also have the same problems, and all of the advice so far is good. the definitive test is to get a silver cell (WM sells them, about $70, I think, and use it with your meter to measure the potential between the water (you hang the cell over the side) and your neutral and ground any voltage over 0.10 volt means that there's a bad connection somewhere-you just have to keep trying different points until you find the bad connection.We actually had a Hunter factory rep on our boat and he said that we didn't have the isolator, they were missed on some boats! by the time he sent one to our dealer to be installed, I had found it, tucked behind the nav station in the corner between the nav and power panels high up. the wires were connected properly, and tight. However, the ground on the keel were loose. so a lot of stuff on the grounding plan was not connected. Also, several of the screws on the neutral and ground power buses on the breaker panel were stripped, and the wires were just flopping around! not just a galvanic issue, a fire/safety issue as well-Dan, those are the other places I'd look. you also can check across ground connections to make sure you don't have any resistence-if you do, take the connection apart, clean, and reassemble