Mercury - Power Center Harness (2.5 m) Rigging Accessory 84-8M0210396. OverviewThis 2.5-meter harness is made for 20-35E electric setups where the power center sits a little farther from the control post. It gives you enough length to run the cable the way you actually want to-without stretching a shorter harness or cramming it through tight corners. Once it's plugged in, the system passes power and control signals cleanly, and the wiring behind the helm looks a whole lot tidier.. Key Features •