Mercury – Tab Extension Harness Assembly | 15-Foot Trim Tab Lead | 84-898059T15

Overview

Longer boats or wide rigging routes sometimes need extra reach to get trim tab wiring where it needs to go. The Mercury 84-898059T15 Tab Extension Harness Assembly adds fifteen feet of clean, OEM-grade cable so the tab system can be routed neatly from the helm to the actuators or control modules. It keeps the wiring organized, avoids tight stretches, and helps the system respond smoothly without strain on the original harness.

Key Features

• 15-Foot Extension – Adds significant reach for trim tab wiring across larger boats.
• OEM Tab Harness Design – Built specifically for extending Mercury trim tab circuits.
• Clean Routing Flexibility – Helps reach helms, transoms, or control modules positioned far apart.
• Secure Connector Fit – Factory-style ends ensure a tight, reliable connection.
• Stable Signal Transfer – Maintains smooth tab response across the full added length.
• Marine-Ready Build – Handles vibration, moisture, and long-term hull movement.

Compatibility

• Mercury trim tab systems
• Tab harness routes requiring extended length
• Helm-to-transom wiring paths on larger boats

Performance & Practical Benefits

This harness gives the rigging enough slack to route tab wiring in a cleaner, less stressful way. The added length helps avoid awkward angles and tight bends that can fatigue a harness over time. With the extension in place, the tabs respond normally, and the wiring stays organized in console chases, under-deck runs, or along long transom routes.

Why Buy OEM

Trim tab systems rely on clean electrical paths to respond consistently. Mercury’s OEM extension harness matches the correct pin layout and shielding, preventing the signal loss or intermittent behavior that cheaper cables sometimes cause. The factory-grade build also ensures long-term durability in vibrating, wet rigging spaces.

FAQ

Q1: When would I need a 15-foot tab extension harness?
Whenever the factory harness cannot reach the trim tab controls or actuators due to boat size or layout.

Q2: Does adding length change tab performance?
No. The OEM harness maintains proper signal flow across the extended distance.

Q3: Is installation difficult?
It installs inline with the existing harness and routes like any standard tab cable.

Q4: Can this be used in saltwater environments?
Yes. The cable jacket and connectors are built for long-term marine use.

Q5: Will this help reduce strain on the original harness?
Yes. More length allows cleaner routing and reduces tension on the factory wiring.