Mercury - Ignition Coil for V6 & V8 MerCruiser Engines Thunderbolt IV/V Series Standard Finish 8M0079202. Overview. Anyone who's spent time behind the helm knows how reassuring it is when your engine lights up instantly - that crisp, confident spark that tells you the day is starting right. When your ignition system is healthy, you feel it in the smooth idle, the steady power, and the lack of hesitation when you throttle up. The Quicksilver Ignition Coil 8M0079202 delivers that kind of trust. De