Mercury - Quicksilver 8M6007460 Alternator, 12-Volt/70 Amp Charging and Electrical Corrosion-Resistant Marine Finish 8M6007460. Overview. Out on the water, you notice pretty quickly which parts you can trust. An alternator either keeps your batteries happy and your gauges steady, or it slowly becomes the reason you head back early. The Quicksilver 8M6007460 alternator is the kind of Mercury Marine part you bolt on and stop thinking about. You turn the key, the engine fires, the lights stay brigh