Boat wiring help

[C-Bass2mouth]

Left the plug in my boat over hunting season and didn't know it. The cover got pulled off a little and filled it with water. I've redone all the main battery connections, motor starts, 12/24V trolling motor/graph/all the switches on the front deck work (trim, etc). Only problem so far is none of the switches at the console work (lights, live well, bilge, acc, horn). In the pics below this (ground Busbar??) Was dangling low enough to be submerged in water. Not exactly sure what it is and haven't been able to trace any of the wiring back yet. I assume it runs to a fuse block that runs to my switch board on the console?

My question is this typically just a grounding Busbar or power? It has one larger black wire plug, so I'm guessing that is from the negative post on my battery. If I were to get a new bar, cut the connectors off, strip the wires back and put new connectors on the new bar should that fix my problem? I bought the boat used so idk if the guy had done this wiring himself or if it typically comes from the factory like that.

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