Mercury - Quicksilver Alternator Marine and Industrial Charging Series Corrosion-Resistant Marine Construction 8M6007517. Overview. Anyone who's relied on a Yanmar engine-whether out on the water or on a jobsite-knows just how important a steady charge really is. When the alternator is dependable, you feel it instantly: gauges stay where they should, electronics stay bright, and the engine seems to breathe easier. That calm, collected feeling is something every boater and equipment operator appr