Mercury – Extension Harness | 2-Pin Excitation and Ground | 84-8M0176942

Overview
This twenty-five-foot harness is built for boats where the rig center and isolator sit far apart and shorter runs just won’t cut it. The extra reach lets you route the wiring in a calm, natural path instead of forcing tight corners or piecing together extensions. It helps keep the rigging bay cleaner and easier to make sense of when you open it up later. On bigger hulls, that extra length makes the whole job feel a lot less cramped.

Key Features
    • 2-Pin Layout – Carries excitation and ground to the isolator.
    • Rig Center Connection – Starts cleanly at the rig center.
    • Isolator Adapter Link – Connects directly to the isolator adapter.
    • Twenty-Five-Foot Length – Designed for long routes on larger boats.
    • Stable Electrical Path – Helps maintain steady isolator operation.

Engine & Boat Compatibility
    • Rig center systems
    • Isolator adapter setups
    • Multi-engine digital layouts

Performance & Practical Benefits
The longer run makes it easier to keep the harness relaxed instead of pinched or pulled tight. That usually leads to fewer wear points and a cleaner layout overall. It’s also easier to trace the harness later since it follows a clear, open route rather than weaving through cramped corners. The result is a neater wiring bay and fewer headaches during service.

Why Buy OEM
OEM harnesses stay reliable through vibration, heat, and long seasons on the water. The connectors seat firmly and match Mercury’s design, helping avoid signal drops or loose joints. It’s wiring you can trust over the long haul.

FAQ
Q1: How do I know I need the twenty-five-foot version?
A: If shorter harnesses leave you stretching the run or forcing tight turns, this length usually fixes the issue.

Q2: Does this harness need calibration?
A: No—once it’s plugged in, it simply carries excitation and ground.

Q3: How does it hold up in saltwater?
A: With basic rinsing and the occasional connector check, it holds up well.

Q4: Any installation tips?
A: Use the extra length to create an easy, natural routing path and leave room for future access.

Q5: What are signs the harness may be wearing out?
A: Flickering signals, inconsistent charging, or corrosion around the connectors.