Mercury - Spark Plug Wire Kit Ignition Wire Set Marine-Grade Construction 899329A09. Overview. There's a certain comfort that comes from knowing your big-block MerCruiser fires strong every time you turn the key. With an engine as powerful as the 8.2L, you can feel instantly when the ignition system is healthy - the smooth startup, the steady idle, the way the boat responds the moment you bring the throttle forward. The Quicksilver 899329A09 Spark Plug Wire Kit keeps that confidence alive. It's