Mercury – Extension Harness | 2-Pin Excitation and Ground | 84-8M0176940

Overview
This fifteen-foot harness is made for situations where the rig center and isolator sit farther apart than usual. Instead of stretching wires or forcing tight turns, you get enough length to route everything in a calm, natural path. It keeps the wiring bay cleaner and easier to work in, especially on larger boats with longer runs. It’s a simple piece, but it takes a lot of stress out of rigging.

Key Features
    • 2-Pin Layout – Sends excitation and ground to the isolator.
    • Rig Center Connection – Starts the run cleanly from the rig center.
    • Isolator Adapter Link – Connects directly to the isolator adapter.
    • Fifteen-Foot Length – Designed for long or wide routing paths.
    • Stable Electrical Path – Helps maintain steady behavior from the isolator.

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

Performance & Practical Benefits
The added length lets you place the harness where it naturally wants to sit, which cuts down on rubbing and tight bends. Longer routing options also make future service easier since the path is cleaner and easier to follow. The electrical behavior stays predictable because the harness isn’t being forced or stressed. It brings a bit of order to spaces that normally feel cramped.

Why Buy OEM
OEM harnesses hold tight through vibration and heat, and the connectors seat the way Mercury intended. That means fewer electrical surprises and a longer lifespan. It’s the kind of part you install once and rely on for seasons.

FAQ
Q1: How do I know I need the fifteen-foot version?
A: If shorter harnesses leave you stretching or forcing tight bends, this length usually fixes the problem.

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

Q3: How does it handle saltwater?
A: Rinse it once in a while and check the connectors; it holds up well.

Q4: Any installation tips?
A: Use the extra length to create a smooth path and leave room for future service work.

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