Mercury - Alternator Belt Poly V Drive Belt Durable Ribbed Design Part Number 897574Q01. Overview. There's nothing quite like the steady confidence you feel when your outboard hums along with every system running just the way it should. The Quicksilver 897574Q01 Alternator Belt is one of those small-but-crucial parts that keeps your day on the water uninterrupted. When this belt is doing its job, your battery stays charged, your electronics stay alive, and your motor runs with the kind of smooth