Mercury - Quicksilver 8M6007459 Alternator, 12-Volt/55 Amp Charging & Electrical Corrosion-Resistant Marine Finish 8M6007459. Overview. There are a few parts you never want to second-guess when you are offshore, and your alternator is one of them. This Quicksilver 8M6007459 alternator is the kind of Mercury Marine part you install once and stop worrying about. You turn the key, the engine fires, the gauges stay steady, and you just get on with your day on the water. Whether you are trolling alon