Mercury – Bullet Connector Harness Adapter | 2-Pin WIF Sensor Link | 84-8M0060421

Overview

Smaller engines often use simple bullet-style connectors for their fuel and paddle harnesses, which can make it tricky to tie in a modern Water-In-Fuel (WIF) sensor. The Mercury 84-8M0060421 Bullet Connector Harness Adapter fixes that mismatch. It converts the engine’s bullet connector lead into a clean 2-pin connection so the WIF sensor can report correctly. It’s a small, practical adapter designed for 150 HP and smaller engines that only support a single fuel-level input.

Key Features

• Bullet-to-2-Pin Adapter – Bridges older bullet-style leads to a standard 2-pin WIF sensor.
• Made for Small Engines – Intended for 150 HP and below that only support one fuel-level signal.
• WIF Sensor Link – Provides the proper connection for reliable water-in-fuel detection.
• Simple Plug-In Fit – No rewiring—just connect the bullet lead and the 2-pin sensor.
• Clean Signal Transfer – Helps ensure the WIF sensor communicates without noise or dropouts.
• OEM-Grade Build – Mercury connectors and sheathing designed for long-term marine use.

Compatibility

• Mercury engines 150 HP and smaller
• Fuel/paddle harnesses using bullet connectors
• 2-pin Water-In-Fuel sensors

Performance & Practical Benefits

This adapter gives smaller engines an easy way to communicate with a modern WIF sensor. Instead of splicing or modifying the original harness, the adapter drops in cleanly and keeps the wiring organized. Once connected, the WIF sensor can report normally, giving you clearer awareness of fuel quality and helping prevent water-contamination surprises.

Why Buy OEM

WIF signals are sensitive, and a loose or mismatched connector can lead to unreliable readings. Mercury’s OEM adapter keeps the pin alignment, shielding, and fit exactly where they need to be. Off-brand adapters often loosen over time or introduce noise into the circuit. The factory version stays secure through vibration and daily use.

FAQ

Q1: When is this adapter needed?
When a small-horsepower engine uses bullet connectors but the WIF sensor requires a 2-pin plug.

Q2: Does this add new features?
No. It simply adapts the connector so the WIF sensor can communicate properly.

Q3: Is it only for engines 150 HP and smaller?
Yes. Those engines use the fuel/paddle harness layout this adapter is designed for.

Q4: Does installation require tools?
No. Both sides plug in directly.

Q5: Will this work in saltwater?
Yes. The OEM materials and seals are built for harsh marine environments.