Mercury - Side Mount Control Harness, 15 Foot with Trim 84-8M0143199. The Mercury Side Mount Control Harness with Trim is designed for mechanical side-mount control systems that require integrated power trim wiring. This 15-foot harness connects the control box to the engine using factory-style connectors, helping ensure proper electrical communication without cutting, splicing, or modifying original wiring. Its length allows for clean routing behind the console, making it suitable for a wide ra