Another thought. On the side of the bulkhead opposite the battery, in the cabin near the shelf, I installed a high amp main cutoff switch. When I leave the boat, and that is switched off, I know the battery is isolated and wont be dead when I return the following week. A word of caution: The cutoff does not cut off the line to the outboard. You may burn out your outboard generator if the electrical is not connected to a battery (the battery acts as a capacitor) when the OB is run. The line from the outboard to the battery must always be connected (at least with the Yamaha, and probably with most other brands as well, I suspect).

I thought I would be having an electrical starter for the OB and ran #6 wires from the battery to the motor well. Not necessary now that I don't have an electrical starter, but they are in place if I ever need them.