Mercury - Bow Trim Harness Bow-Mounted Trim Wiring 84-8M0169506. OverviewThis bow trim harness gives you a clean way to run trim control from a bow-mounted button back to the engine's cowl trim switch. It's the wiring path that lets you trim the engine without reaching the helm-handy when you're working up front or loading the boat. The harness keeps things tidy and avoids the hassle of splicing or improvising your own connections. It works on all 2004-and-newer DTS engines.. Key Features • Bow