Mercury – Outer Helm Extension Harness | 50-Foot Extension | 84-8M0173571

Overview
This 50-foot extension harness is made for big wide-beam boats where the outer engines sit a long way from the helm. When the standard harness doesn’t even come close—or the routing path snakes around bulkheads and long rigging channels—this extension gives you the reach you need without forcing anything. It lets the wiring settle into a smooth, natural run so the controls stay steady. On large triple- or quad-engine rigs, that extra length makes rigging and service a lot less stressful.

Key Features
    • 50-Foot Extension – Long enough for wide transoms, long tunnels, and stretched engine spacing.
    • Outer-Engine Use – For the outside engines on triple and quad DTS setups.
    • OEM Connectors – Factory-fit ends that snap in tight and stay locked.
    • Flexible Routing – Helps avoid tight corners, rubbing points, and strained wiring.
    • Consistent Control Path – Supports smooth throttle and shift communication over long distances.

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

Performance & Practical Benefits
On big offshore boats, this extra length keeps the harness from being jammed into cramped sections or pulled across sharp turns. When the wiring can run naturally, the controls feel smoother and more predictable. It also gives you far more room to work during inspections or service, instead of wrestling with a harness that barely reaches. Everything ends up looking cleaner, and the system runs with less strain.

Why Buy OEM
OEM harnesses hold up to heat, vibration, and saltwater much better than generic cable. The connectors fit the DTS system exactly, so you’re not dealing with loose plugs or odd electrical quirks. It’s reliable rigging meant for real-world offshore use.

FAQ
Q1: How do I know I need the 50-foot version?
A: If your outer engines sit far outboard and shorter extensions won’t reach cleanly, this is the length that usually fixes it.

Q2: Do I need to configure anything after installation?
A: Nope—just plug it in.

Q3: How does it handle saltwater?
A: Very well. Rinse once in a while and keep an eye on the connectors.

Q4: Any install tips?
A: Give the harness a relaxed route with long, smooth curves to avoid wear spots.

Q5: What are signs the harness may be wearing out?
A: Hesitant controls, intermittent signals, or areas where the jacket is rubbing thin.