Mercury - 2-Pin Extension Harness (15 ft) Rigging Accessory 84-8M0191741. OverviewThis 15-foot extension harness gives you the extra length you need to run the electric steering actuator wiring through the rig tube and up under the cowl without fighting tight bends or stretched wires. It's meant for setups where the shorter harnesses simply won't reach cleanly. Each actuator gets its own harness, which keeps the wiring relaxed and helps the steering system respond the way it should.. Key Feature