Mercury – Outer Helm Extension Harness | 30-Foot Extension | 84-8M0159754

Overview
This 30-foot extension gives you the extra distance needed to reach the outer engines on wide-beam triple- and quad-engine boats. When the standard harness just isn’t long enough—or the routing path snakes around bulkheads—this extension keeps things from getting stretched or kinked. It lets the wiring take a calm, natural route instead of being forced into tight corners. On larger rigs, that extra length makes the whole setup feel a lot more manageable.

Key Features
    • 30-Foot Extension – Long reach for wide transoms and extended rigging runs.
    • Outer-Engine Use – For outer engines on triple and quad DTS configurations.
    • OEM Connectors – Factory ends that snap in securely and stay locked.
    • Flexible Routing – Helps avoid tight bends, pinches, and stressed wiring.
    • Reliable Signal Path – Keeps control communication steady across long runs.

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

Performance & Practical Benefits
The extra length keeps the harness from being pulled across tight corners, which helps control input feel smoother and more predictable. It also opens up the rigging bay a bit, making service work easier because the wiring isn’t jammed into one tight lane. On big offshore hulls, having room to route the outer-engine run cleanly makes a noticeable difference in day-to-day use.

Why Buy OEM
OEM harnessing stands up to vibration, heat, and saltwater far better than generic cable. The connectors match Mercury’s spec exactly, which means fewer loose connections and fewer strange electrical hiccups. It’s wiring you can trust over the long haul.

FAQ
Q1: How do I know I need the 30-foot version?
A: If the outer-engine harness feels short or forces tight bends on a wide-beam triple or quad setup, this length usually solves it.

Q2: Any setup or calibration needed?
A: None—just plug it in and route it.

Q3: How does it hold up in saltwater?
A: Very well—just rinse occasionally and check the connectors.

Q4: Any installation advice?
A: Give it a smooth path with gentle curves so nothing gets stretched or rubbed.

Q5: What are early signs the harness may be wearing out?
A: Hesitant controls, signal dropouts, or visible abrasion along the jacket.