Mercury - Alternator Honda Outboard Charging System Marine-Grade Build 8M6007473. Overview. If you run a Honda outboard, you already know they're quiet, steady, and built to go the distance. But none of that matters if your charging system can't keep up with your time on the water. Whether you're trolling at sunrise, pushing offshore toward clean blue water, or drifting with the wind while the electronics hum around you, you need an alternator that simply does its job without a hint of strain..