Mercury - Quicksilver Alternator High Output Charging Series Corrosion-Resistant Marine Construction 8M6007474. Overview. Every boater knows the comfort that comes from glancing at the gauges and seeing everything running strong and steady. It is the quiet reassurance that your batteries are charging, your electronics have what they need, and your engine is getting the support it depends on. That peace of mind is not flashy, but it is worth everything when you are miles from the dock with a full