Mercury - Next-Gen ERC Extension Harness Kit (Dual) 10-Foot Extension 98-8M0173879. OverviewThis ten-foot harness gives a dual-engine Next-Gen ERC setup some extra breathing room when the factory lead just won't reach comfortably. Boats with longer runs or tighter rigging spaces often need a little more slack, and this extension keeps you from forcing the wiring into sharp bends. It lets the harness take a smoother path so the controls feel more natural. It's a simple add-on that makes dual-engi