Mercury – Outer Helm Extension Harness | 35-Foot Extension | 84-8M0159755

Overview
This 35-foot extension harness is built for wide-beam triple and quad engine boats where the outer engines sit a long way from the helm. When the standard harness won’t reach cleanly—or the routing path winds around bulkheads—this extension keeps you from pulling the wiring tight or forcing awkward bends. It lets the harness run in a smoother, more natural line so everything feels calmer at the controls. On larger offshore rigs, that extra length makes the whole setup far easier to rig and service.

Key Features
    • 35-Foot Extension – Long reach for wide transoms and extended routing paths.
    • Outer-Engine Use – For the outside engines on triple and quad DTS setups.
    • OEM Connectors – Factory ends that snap in solid and stay locked.
    • Flexible Routing – Helps avoid tight corners, pinched runs, and stressed wiring.
    • Reliable Control Path – Supports steady throttle and shift communication.

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

Performance & Practical Benefits
With this much extra length, the wiring can follow an easy, natural route instead of being squeezed into tight spaces. Controls usually feel smoother because the harness isn’t kinked or stretched across the boat. It also opens up the rigging bay, giving you room to work during service instead of fighting a cramped layout. For bigger offshore boats, it simply makes everything feel better organized.

Why Buy OEM
OEM harnesses stand up to vibration, heat, and saltwater better than generic cable. The connectors match Mercury’s design exactly, so you’re not dealing with loose plugs or surprise glitches. It’s wiring meant for real marine use and long-term reliability.

FAQ
Q1: How do I know I need the 35-foot version?
A: If your outer-engine run feels tight or won’t reach cleanly on a wide triple or quad, this is the length that solves it.

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

Q3: Saltwater safe?
A: Yes. Rinse occasionally and check the connectors and it holds up well.

Q4: Any installation tips?
A: Keep the path smooth with wide curves so nothing gets pulled tight or rubbed.

Q5: Signs the harness may be wearing out?
A: Sluggish control response, random dropouts, or visible jacket wear along the run.