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 range of boat layouts.

Maintaining quality control and trim wiring is essential for consistent trim response and reliable operation. Replacing worn or aging harnesses can help prevent intermittent trim issues caused by corrosion, loose connections, or damaged wiring. Using a matched OEM harness helps preserve system integrity and supports long-term electrical reliability.

Key Features

• Integrated Power Trim Wiring – Supports trim operation directly from a side-mount control
• 15-Foot Harness Length – Allows flexible routing across various console and boat layouts
• Factory-Style Connectors – Secure electrical connections without cutting or splicing
• Mechanical Control Compatible – Designed for cable-driven throttle and shift systems
  
  

Engine & System Compatibility

• Mercury outboards
• Mechanical (cable-driven) control systems
• Power trim–equipped applications
  
  

Important Notes

• Wiring and connector requirements can vary by engine model and existing rigging
• Confirm control style, trim system configuration, and connector compatibility before ordering
• Proper routing, strain relief, and secure connections are required for reliable operation
  
  

FAQs

1) What is this control harness used for?
It connects a mechanical side-mount control box to a Mercury outboard while providing integrated power trim wiring.

2) Does this harness include trim wiring?
Yes. It includes built-in power trim wiring for trim operation at the control.

3) Is cutting or splicing required for installation?
No. The harness uses factory-style connectors designed for direct connection.

4) What length is this harness?
This harness measures 15 feet, supporting flexible routing for various boat layouts.

5) Why choose an OEM Mercury control harness?
OEM harnesses are built to Mercury’s wiring standards and connector tolerances, helping reduce electrical issues and support long-term reliability.