Mercury - Next-Gen ERC Extension Harness Kit (Dual) 5-Foot Extension 98-8M0173753. OverviewThis five-foot extension gives a dual-engine Next-Gen ERC setup the extra reach it sometimes needs when the stock harness won't quite make the run. It's useful on boats where the rigging path takes a sharper turn or the controls sit farther from the rig center than expected. Instead of forcing the wiring to stretch or snake through tight corners, this extension lets everything follow a smoother, cleaner ro