Mercury - Electric Steering Harness (12 ft) Rigging Accessory 8M0191736. OverviewThis 12-foot harness gives the electric steering actuator a solid power and ground line with plenty of length to route wherever you need it. It's useful on bigger boats where the actuator isn't sitting close to your main rigging path. Each actuator gets its own harness, which keeps the connection clean and consistent. Once everything's wired in, steering usually feels more steady, especially during slow, careful mov