The Buckshot Racing #77 Trim & Tilt Relay Harness by API Marine is designed to convert older 3-wire trim/tilt systems to modern 2-wire configurations, while also serving as a reliable replacement and upgrade for existing relay setups. This conversion simplifies wiring and improves efficiency, as 2-wire trim motors typically draw less amperage and operate more efficiently than older 3-wire systems.
This harness is compatible with a wide range of Mercury Marine, Mariner, Force, Yamaha, OMC (Johnson/Evinrude), and Volvo trim and tilt systems, making it a versatile solution for both restoration and performance applications.
Simplified 2-Wire Conversion
Many older outboards were equipped with 3-wire trim motors, which require more complex wiring and higher current draw. This harness allows you to convert those systems to a 2-wire relay-controlled setup, which is now the industry standard.
By simplifying the circuit, the system becomes more efficient, easier to troubleshoot, and more reliable under load, especially in high-use or performance environments.
Complete Relay and Harness Assembly
This assembly includes two pre-wired relays integrated into a complete harness, eliminating the need for custom wiring. The layout is designed to match common marine configurations, reducing installation time and minimizing wiring errors.
A 50-amp inline MAXI blade fuse is built into the harness, providing essential circuit protection against overloads or electrical faults. This helps protect the trim motor, relays, and wiring from damage during operation.
The harness is designed to integrate cleanly with existing wiring systems, making it suitable for both OEM replacement and custom rigging setups.
Wide Compatibility Across Marine Platforms
The Buckshot Racing #77 relay harness is cross-compatible with many OEM systems and replaces a wide range of part numbers, including: CDI 852-9820, Mercury 882751A1 through 882751A9, and 8M0057693
It is commonly used on Mercury 2.0L, 2.4L, 2.5L, and 3.0L outboards, as well as many Yamaha and OMC applications using similar trim systems.
Because of its universal design, this harness is ideal for both stock engines and high-performance builds, including bass boats, offshore setups, and racing applications.
Installation Overview
Installation is straightforward when standard marine wiring practices are followed. The system connects the blue and green trim motor wires to the relay outputs, while the blue/white and green/white wires tie into the control circuit from the trim switch.
Power is supplied by routing the red lead to the starter solenoid or regulator/rectifier positive terminal, ensuring a stable 12V source. The integrated fuse protects the circuit during operation.
As with any electrical work, the battery should be disconnected before installation. Once installed, the trim system should be cycled fully up and down to confirm proper operation.
Built for Marine Durability
Constructed with marine-grade wiring, sealed relays, and heavy-duty connectors, this harness is designed to withstand the harsh conditions of heat, vibration, and moisture found in marine environments.
Routine inspection of wiring connections and the fuse is recommended, especially in saltwater applications, to ensure long-term reliability.
Reliable Upgrade for Trim System Performance
Upgrading to a 2-wire trim/tilt relay system is one of the most effective ways to improve electrical efficiency and reliability on older outboards. By reducing amp draw and simplifying wiring, this harness helps ensure consistent trim operation when you need it most.
The Buckshot Racing #77 Trim & Tilt Relay Harness by API Marine provides a clean, reliable solution for converting and upgrading trim systems across a wide range of Mercury, Yamaha, OMC, and other marine platforms, making it an essential component for both maintenance and performance rigging.
Contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com