Mercury - Rig Center Harness Accessory Breakout Harness 84-8M0173598. OverviewThis breakout harness gives you a clean way to branch signals out of the rig center without cutting into anything or forcing makeshift splits. It's an easy add-on when you're trying to keep the wiring tidy while adding accessories or cleaning up an older layout. The harness keeps things organized so you're not digging through a knot of wires later. It's a simple piece, but it makes day-to-day rigging work a lot smoothe