Fstbttms once again, I have to take issue with your statements.
You said:
"This is called "burn back" and is typically due to improperly primed metal in contact with your anti fouling paint. Perhaps not the case with your grounding plates, but still, it had nothing to do with the marina shore power."
Unlike the yard, you didn't see the problem. You admit that your burn back diagnosis doesn't apply to Minni's case, yet rule out the yard's answer regarding the marina.
"Why would you assume the yard knew the first thing about the product they applied? Their expertise lies in assigning blame elsewhere."
There are good yards and bad yards, just as there are good divers and bad divers. You don't know which yard was used, have no idea what they do or don't know, yet paint all yards with the broad brush of only knowing how to "assign blame".
I could go on shooting holes in your statements, but my point is this: As a boat diver, you are a marine professional. However, you are not a electrician, and I'm willing to bet there are some very knowledgeable boat workers who would be very offended by your baseless comments. Talk is cheap on the Internet.
When I use the term "hot marina", I simply mean there is current in the water that shouldn't be there. My guess is that in the vast majority of marinas in which that condition exists, it's the fault of a boat owner, not the marina.
I realize that you make your living in marinas, yet, you seem overly defensive of them. You responded to my OP assuring me that my situation was not the result of a hot marina (despite evidence to the contrary). However, it now turns out that my marina obviously believes there is a issue.
Ironically, in talking to the marina, it was apparent that what motivated them to get the instrument and start testing was the fear of frying a diver, not boat maintenance issues.
You might want to think about that before blowing off reports of hot marinas as "wives tales"!