Mercury Halon & Key Switch Adapter Harness
Genuine Mercury Halon and key switch adapter harness designed to integrate fire suppression systems and ignition circuits into compatible Mercury SmartCraft and diesel engine installations.
Compatible With:
- CMD QSD 2.0 Diesel Engines
- CMD QSD 2.8 Diesel Engines
- CMD QSD 4.2 Diesel Engines
- Mercury SmartCraft Diesel Installations
- Zeus SmartCraft Rigging Systems
- Mercury Fire Suppression System Installations
- Mercury SmartCraft Engine Shutdown Circuits
The Mercury Marine 879312T20 Harness Adapter is a genuine Mercury OEM wiring harness designed to integrate Halon fire suppression systems and ignition key switch circuits into compatible Mercury SmartCraft and diesel engine installations. Commonly referred to as a Halon Breakout Harness, this adapter allows the ignition circuit to be interrupted by an approved fire suppression system, helping meet marine safety requirements on vessels fitted with automatic engine room fire systems.
The harness features OEM Mercury connectors for plug-and-play installation and is designed to maintain factory wiring integrity while providing a safe connection point for engine shutdown and accessory integration. It is widely used on Mercury diesel, Cummins MerCruiser Diesel (CMD), QSD and SmartCraft-equipped vessels where automatic engine shutdown functionality is required.
Manufactured to Mercury Marine specifications, the harness uses marine-grade wiring and sealed connectors designed to withstand moisture, vibration and harsh marine conditions. Genuine Mercury harnesses ensure reliable operation and compatibility with factory electrical systems.
