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Hi,
Turning everything off isn't a bad idea if you have no idea how long there has been a fault and there maybe several problems, I took it for granted that this guy was paying attention to his monitoring system and this was an early indication.
Also don't forget to include the engines and engine control system in your circuit isolation.
What brand of boat are you dealing with here? I ask this knowing that some well known boat builders use 24V Control for their switchboards and this could be very difficult to isolate in one go.
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Cheers,
K1W1
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