Mercury - Quicksilver Fuse Assembly 90 Amp Outboard, Sterndrive & Inboard Systems 79023T90. Overview. A reliable fuse might not look like much, but it's one of the most important safety components in your boat's electrical system. The Mercury Marine 79023T90 Quicksilver Fuse Assembly is a 90-amp fuse designed for use with outboards, sterndrives, and inboard engines. With a 5/16-inch (8mm) mounting hole, it's easy to install in a range of setups. Built to Mercury's standards, it delivers dependab