Mercury - Quicksilver 816608Q83 Red Wire Spark Plug Wire Kit V8 GM MerCruiser Engines (305, 350, 377 CID) Mercury Ignition 816608Q83. Overview. Good spark is what keeps your boat running smooth and strong. The Quicksilver 816608Q83 Red Wire Spark Plug Wire Kit is built for V8 GM-based MerCruiser engines (305, 350, and 377 CID) that use Mercury ignition systems (1999-2001).. Each wire is cut to the exact length for your setup, with molded boots that fit snug and seal out moisture. The red jacket