That's not a helpful comment.
As others said, it is a receptacle for plugging in your trolling motor. My guess is that you've tried connecting the trolling motor and it didn't work. Before you start throwing parts at the problem, I would verify that the trolling motor works. The receptacle should also be connected to a fuse. Check the fuse to make sure that is not blown. The trolling motor pedal can also be toast. It looks like a pretty old unit.