Mercury - Quicksilver 8M6007463 Alternator 7SI Series Marine-Grade Finish 8M6007463. Overview. There's a certain comfort that comes from turning the key and hearing your engine fire up with the confidence of a well-kept boat. When you're out on the water, miles from the noise of the shoreline, you want every part beneath the cowling to feel dependable. That steady hum isn't just sound-it's reassurance. The Mercury Marine part number 8M6007463 alternator brings that kind of quiet confidence to yo