Mercury – Extension Harness | 2-Pin Excitation and Ground | 84-8M0176939

Overview
This ten-foot harness gives you the extra reach you need when the rig center and isolator aren’t close together. It keeps things simple—just a clean way to run excitation and ground without stretching or forcing wires around tight corners. The longer run also makes it easier to route the harness in a way that actually makes sense when you open the rigging bay later. It’s a small piece, but it helps the whole setup feel a lot more manageable.

Key Features
    • 2-Pin Layout – Carries excitation and ground to the isolator.
    • Rig Center Connection – Plugs into the rig center as the starting point.
    • Isolator Adapter Link – Connects directly to the isolator adapter.
    • Ten-Foot Reach – Extra room for boats with longer or awkward routing paths.
    • Steady Signal Path – Helps keep electrical behavior predictable.

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

Performance & Practical Benefits
With the extra length, you can route the harness in a smoother path instead of cramming it into tight spaces. That usually means less rubbing and fewer pinch points down the road. It also makes it easier to follow the wiring later if you need to chase an issue. The whole rigging area ends up feeling cleaner and less cramped.

Why Buy OEM
OEM harnesses hold tight and stay stable even after long seasons of heat and vibration. The connectors match the system the way Mercury intended, which helps avoid weird electrical quirks. It’s the sort of part you install once and don’t have to think about again.

FAQ
Q1: How do I know this is the right length?
A: If your isolator sits a bit farther from the rig center and shorter harnesses feel too tight, this one usually solves it.

Q2: Does the harness need calibration?
A: No—once plugged in, it just carries the excitation and ground.

Q3: How does it handle saltwater?
A: A quick rinse and occasional connector check keep it in good shape.

Q4: Any installation tips?
A: Use the extra length to make a relaxed routing path and leave room for future access.

Q5: What are early signs the harness might be wearing out?
A: Flickering readings, inconsistent charging, or corrosion around the connector.