"this is one of the number one reasons for boat fires"
I have seen this happen.
Throw out the burned unit, both the female end on your cord and the male end on your boat.
You might try the newer "smart plug" as a replacement that is unlikely to suffer the same fate. When I switched mine over to a "Smart plug" my insurance Co sent me a cheque for $125.00 on a $185. cost to convert. I had to send a digital photo to show the installation was complete.
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