Mercury – Extension Harness | 2-Pin Excitation and Ground | 84-8M0176937

Overview
This extension harness gives you a simple way to run excitation and ground to the isolator without stretching or patching together old wiring. It’s a small part, but it makes the layout around the rig center cleaner and easier to work around. At five feet long, it gives you enough room to route it neatly instead of forcing tight bends. It’s the kind of piece you appreciate when you're trying to keep the rigging bay from turning into a mess.

Key Features
    • 2-Pin Design – Carries excitation and ground to the isolator.
    • Rig Center Connection – Plugs directly into the rig center for clean routing.
    • Isolator Adapter Link – Connects securely to the isolator adapter.
    • Five-Foot Length – Offers enough slack for easy, tidy rigging.
    • Stable Signal Path – Helps maintain reliable electrical behavior.

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

Performance & Practical Benefits
A dedicated harness keeps the excitation and ground path predictable, which cuts down on odd electrical behavior. The length makes it easier to route without forcing tight turns or awkward tie points. It also makes troubleshooting simpler since you aren’t dealing with improvised wiring. Everything ends up feeling cleaner and more intentional behind the scenes.

Why Buy OEM
OEM harnessing keeps the electrical path solid and avoids the voltage drops that show up with off-brand wiring. The connectors seat properly, hold tight, and handle heat and vibration day after day. It’s a small part, but using OEM keeps the whole system steadier.

FAQ
Q1: How do I know I need this harness?
A: If your isolator setup needs excitation and ground from the rig center and your current wiring won’t reach, this solves that gap.

Q2: Does it require calibration?
A: No—once connected, it simply carries the signal and ground.

Q3: How does it hold up in saltwater?
A: With normal rinsing and a quick check on the connectors, it holds up fine.

Q4: Any installation tips?
A: Give yourself enough slack to avoid sharp bends—five feet is usually plenty.

Q5: What are early signs of a failing harness?
A: Flickering signals, intermittent charging behavior, or visible connector corrosion.