Mercury – Outer Helm Extension Harness | 60-Foot Extension | 84-8M0173572

Overview
This 60-foot extension is built for big offshore boats where the outer engines sit way outboard and the standard harness just won’t make the run. When the routing path winds through long tunnels or past multiple bulkheads, this length keeps you from stretching or forcing the wiring. It lets the harness relax into a natural line so the controls stay smooth and predictable. On large triple- or quad-engine rigs, it simply makes the whole system easier to rig and easier to service.

Key Features
    • 60-Foot Extension – Long reach for wide beams, deep hulls, and extended rigging channels.
    • Outer-Engine Use – For the outboard engines on triple and quad DTS setups.
    • OEM Connectors – Factory ends that lock in tight and stay put.
    • Flexible Routing – Helps avoid pinch points and sharp corners.
    • Steady Control Path – Maintains clean throttle and shift communication over long distances.

Engine & Boat Compatibility
    • Triple engine
    • Quad engine
    • Outer-engine helm pathways

Performance & Practical Benefits
On wide-beam or long-deck boats, this extension keeps the wiring from getting jammed into tight spaces or pulled across hard bends. With a smoother route, the controls feel more natural and responsive because the harness isn’t strained. It also gives you room to actually move around during service instead of fighting a line that barely reaches. The whole rig feels more settled and easier to handle.

Why Buy OEM
OEM harnesses hold up far better to vibration, heat, and saltwater than aftermarket versions. The connectors match Mercury’s spec perfectly, which cuts down on loose plugs and random glitches. It’s wiring you can trust on long offshore runs.

FAQ
Q1: How do I know I need the 60-foot version?
A: If your outer-engine run is long enough that a 50-foot extension still comes up short, this length is the safe bet.

Q2: Any setup or programming needed?
A: No—just plug it in and route it.

Q3: How does it handle saltwater?
A: Great. A light rinse and occasional connector check keep it in good shape.

Q4: Any installation tips?
A: Keep the path smooth with broad curves so nothing gets rubbed or pinched.

Q5: What are early signs of wear?
A: Hesitant controls, intermittent signals, or jacket scuffing along the run.