Mercury - Quicksilver Ignition Coil Assembly Electrical System Component OMC Outboards 802371A1. Overview. A strong spark is the foundation of smooth engine performance, and the Mercury Marine 802371A1 Quicksilver Ignition Coil Assembly delivers exactly that. Built to the same standards as the original OMC part, this coil restores crisp ignition timing and dependable starts for select OMC outboards. Designed for life in harsh marine environments, it resists corrosion, heat, and vibration while m