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Find the end of the shore cord and track the black lead back to the batteries. It may go though a shortstop breaker first. Those are mounted on the bulkhead behind the batteries. I am enclosing a link to a photo of some. Most have a small black button on the side which you have to push in so it will reset. Might be hard to see. Most have a red cover over them. If you have a 12 VDC test light this is easy to track down. Check the connection off the cord which should be up in the area of the pin box. That may have come loose. Hope that proves helpful here. Please get back to me if you need more later as all follow ups are included in our fee.
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Ellen
Licensed mechanics