Mercury - Quicksilver 8M0218433 Alternator Belt High-Output Accessory Drive Series Reinforced Rubber 8M0218433. Overview. If you spend enough time on the water, you learn which parts you can trust without thinking twice-those pieces of equipment that quietly do their job while you focus on the tide, the weather and the run ahead. The Mercury Alternator Belt 8M0218433 is one of those parts. It delivers the kind of quiet reliability you only appreciate when you've been far from the dock and everyt