Mercury - Next-Gen ERC Extension Harness Kit (Single) 10-Foot Extension 98-8M0173878. OverviewThis ten-foot extension gives a single-engine Next-Gen ERC setup the extra distance it needs when the stock harness just won't reach cleanly. It's useful on boats where the rigging path runs a little farther than expected or takes a few tight turns. Instead of stretching the wiring or forcing awkward bends, this extension lets everything lay out naturally. It's a simple way to make the control run feel