Mercury - Next-Gen ERC Extension Harness Kit (Quad) 5-Foot Extension 98-8M0173755. OverviewThis five-foot extension gives a quad-engine Next-Gen ERC setup a little more breathing room when the stock harness just doesn't reach comfortably. With four engines feeding into the system, the wiring path can get cramped fast, and this extension keeps you from forcing tight bends or pulling the harness too hard. It lets the run sit in a cleaner, more natural line so everything feels calmer at the helm. I