Mercury - Power Center Harness (3.0 m) Rigging Accessory 84-8M0210397. OverviewThis 3-meter harness is for 20-35E electric setups where the power center and control post aren't close together. It gives you enough length to run the cable the way you actually want to-without stretching a shorter harness or forcing it into tight corners. With the extra reach, the wiring lays cleaner, looks better behind the console, and helps the system communicate smoothly.. Key Features • 3.0 m Length - Good for