Mercury – Tab Extension Harness Assembly | 25-Foot Trim Tab Lead | 84-898059T25

Overview

Large boats and long rigging runs often need more room to position trim tab wiring cleanly. The Mercury 84-898059T25 Tab Extension Harness Assembly adds twenty-five feet of length, giving you the flexibility to route the harness through console chases, under-deck channels, or wide transom spans without stressing the original wiring. Once installed, the system responds smoothly and the rigging looks far more organized.

Key Features

• 25-Foot Extension – Provides maximum reach for long helm-to-transom trim tab wiring runs.
• OEM Tab Harness Design – Built to extend Mercury trim tab system wiring with proper fit and shielding.
• Flexible Routing Options – Ideal for larger hulls, complex rigging paths, or wide-beam layouts.
• Factory Connector Ends – Ensures a secure, plug-in connection without modification.
• Stable Electrical Path – Maintains consistent trim tab response across the entire extension length.
• Marine-Ready Construction – Withstands vibration, moisture, and long-term movement in rigging spaces.

Compatibility

• Mercury trim tab systems
• Boats requiring a 25-foot extension run
• Long helm-to-transom rigging layouts

Performance & Practical Benefits

This extension harness gives you the reach needed to route trim tab wiring through the boat without tight bends or tension on the original harness. The added length is especially helpful on larger center consoles, dual-station boats, and wide transom designs. Once in place, the tab system behaves normally and the wiring stays protected and organized along its path.

Why Buy OEM

Trim tab wiring needs proper shielding and connector integrity to avoid signal issues. Mercury’s OEM extension harness matches the system’s electrical requirements, preventing the loose connections and intermittent performance common with aftermarket cables. The factory-grade build ensures long-term reliability in harsh marine environments.

FAQ

Q1: When should I use the 25-foot tab extension?
When the factory harness won't reach the helm or control module due to long or complex rigging routes.

Q2: Will this extra length affect tab performance?
No. The OEM cable maintains clear signal flow across the full 25 feet.

Q3: Is installation straightforward?
Yes. It plugs inline and routes like any standard tab harness.

Q4: Does it work well in saltwater?
Yes. The jacket and connectors are designed for long-term exposure.

Q5: Does the added length reduce strain on the original harness?
Absolutely—extra reach allows cleaner routing and avoids over-tightening the primary cable.