Mercury - Quicksilver Alternator Yamaha / Mando Series 12-Volt / 55 Amp 8M6007464. Overview. There's a certain comfort that comes from turning the key on a quiet morning and hearing your engine fire up without hesitation. You feel it in your shoulders, that little release of tension that only boaters really understand. When you rely on your rig for long days on the water-whether you're chasing fish before sunrise or cruising with the family at sunset-your charging system can't be an afterthought