Mercury - Quicksilver Alternator Marine & Industrial Charging Series Corrosion-Resistant Construction 8M6007520. Overview. Anyone who runs a Yanmar engine - whether on the water or on the job - knows how much your day depends on steady, reliable electrical power. When your gauges stay bright, your batteries charge cleanly, and your electronics respond without hesitation, everything feels easier. It lets you settle in, trust the engine, and focus on the run ahead. The Mercury Marine part number 8