I had a similar issue. On the starter for my boat, there is a 90 amp fuse that attaches the battery+ to all the electrical on the boat (via the fuse box). Anyway, mine melted and I had no power. I would guess you could be heating it up and then it shorts out. Pretty easy to put a meter on it and start the boat to see if it cuts out there. If it does, you know its the fuse, if not, then you should have power to the fuse panel.
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