New Mercury & Mariner 4-Cylinder Internal Outboard Wiring Harnesses

This page provides a dedicated collection of internal wiring harnesses tailored to 4-cylinder outboard engines, specifically for Mercury & Mariner brands. These harnesses are essential components of the controls and rigging,  ensuring proper connection and communication between engine sensors, controls, and the boat’s electrical system. Whether you need OEM-quality replacements or aftermarket alternatives, ObParts offers a variety of durable wiring options designed for dependable marine performance and compatibility with multiple 4-cylinder engine models. Explore the complete selection to keep your vessel running smoothly.