NB, interesting story on the Ferrari.. I am not an electric engineer so I couldn't explain why that would work but from my limited experience I have seen that there are many different ways these systems (car or boat) over the years have been set up.
As an example, as many may recall, you could run your car or boat without the battery at all. You could start a boat just by jumping it off a battery or another boat and as long as the engine was running you were fine. However 2 years ago I found out the hard way that on newer boats the circuits are set up a bit different. I was out on my 17 foot runabout. The boat was going perfectly and then just stopped. I checked everything and couldn't figure it out. I thought the way it simply shut off that there was a fuel pump problem.
After getting towed back and checking everything I noticed the battery connections were a bit corroded. Never would I think that this was the problem but thought it was best to clean them regardless.... Guess what! that was it. Somehow if the ciruit was broken (due to the corrossion) on the battery terminals the boat would not run.
Needless to say I now keep them very clean and keep a wire brush in my tool box.
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Have you had your Vessel Inspected Yet?
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