Mercury – Outer Helm Extension Harness | 70-Foot Extension | 84-8M0173573Mercury Outer Helm Extension Harness 70 Foot Extension 84 8M0173573 OverviewThis 70 foot extension harness is built for the biggest, widest triple and quad engine boatssetups where the outer engines sit so far outboard that even long standard harnesses wont reach cleanly. When the wiring path winds through long tunnels, bulkheads, or deep rigging channels, this extension keeps you from stretching or forcing the harness. It lets the wiring run in a