Mercury - Quicksilver 816761Q14 Spark Plug Wire Kit 3.0L & LX MerCruiser Engines Delco EST Ignition 816761Q14. Overview. A strong, steady spark is what keeps your MerCruiser engine running smooth and dependable. The Quicksilver 816761Q14 Spark Plug Wire Kit is built for 3.0L and LX MerCruiser engines (1990-2016) equipped with Delco EST ignition systems. This OEM wire set restores reliable spark delivery, cleaner ignition, and the long-lasting durability that Mercury owners count on.. Each wire i