I snatched up an onboard charger that was on another fishing forum classified board this week. My plan for the install was to hard wire the charger into a permanent plug that could be easily accessed without crawling in and out of the boat. I’ve had a charger for my bow mount batteries but not the starting battery. Here’s my install with easy plug-in.
I mounted the charger to a piece of sealed plywood
Boxed this recessed male outlet at the transom
Water cover