Mercury - Quicksilver Spark Plug Wire Set Ignition System Marine-Grade Construction 881908T. Overview. There's something reassuring about knowing your ignition system fires clean and steady every time you turn the key. When you're heading out before sunrise or easing back toward the dock at dusk, you want to feel that quiet confidence - that gentle hum of an engine responding exactly the way it should. This Mercury Marine part brings that kind of reliability to life. With a fresh set of spark pl