Second job after removing all the electrics, remove the heat shrink from the batteries. Having sunk before (only once ) learnt the hard way moisture inside the heat shrink will rust the connection tabs. Next year no power, and a new battery. Replaced heat shrink with duct tape, having dried over night.
Here is the evidence Derek. Only over at 70deg and the water over the combing. Lucky it hadn't happened before.
Two options increase the height of the combing, not scale. The Irene's load line was only 18ins of freeboard, they must have battened the hatch tight. Or seal the hatch 1/2ins below the top of the combing. Bring the switch wire up through with silicone, stopping ingress. Replace the tube for the carry handle with a larger diameter, and longer, seal again. Also replace lifting rod with a piano wire. Any water getting on the sealing plate can go down the tube, instead of filling the boat. That's the theory, we shall see.