Mystery hose
Actually that hose is the split loom that has all the wiring for my electric sub panels. It runs from the main panel to the sub panel. I made an auxiliary panel to handle the main switch and additional switches. There is a 3rd panel to handle the wind turbine and the solar panels where the original panel was over the steps.
I know, it's like a monster. It keeps growing. There is no end to it although I am through with the cabin and deck and starting on stripping the mast and replacing all those disolved plastic sheaves, new hallyards and re building the reefer.
Labor of love and cheaper than paying for therapy.
Jose