Mercury – SmartCraft Extension Harness | 3-Foot 10-Pin Extension | 84-8M0138593

Overview

Sometimes a SmartCraft connector just needs a little more reach to land cleanly at the helm or junction box. The Mercury 84-8M0138593 Extension Harness adds a simple three feet of length to any 10-pin SmartCraft connection, giving you the extra slack needed to route cables without stretching or forcing tight bends. It keeps the network clean, organized, and easier to rig in tight spots.

Key Features

• 3-Foot Extension – Adds a short, practical length to tight SmartCraft routing paths.
• Fully Populated 10-Pin Harness – All ten pins are active for complete SmartCraft communication.
• Plug-In OEM Connectors – Uses factory SmartCraft ends for a secure, proper-fit connection.
• Flexible Rigging Use – Ideal for short-distance extensions behind consoles or near junction boxes.
• Stable Data Transfer – Maintains reliable CAN communication across the added length.
• Marine-Ready Cable – Built to handle vibration, heat, and long-term helm exposure.

Compatibility

• 10-pin SmartCraft harnesses
• SmartCraft junction boxes
• SmartCraft CAN P network connections
• Engine and helm SmartCraft interfaces

Performance & Practical Benefits

This extension makes SmartCraft routing easier, especially in tight helm spaces or rigs where the original cable comes up a little short. The fully populated 10-pin design ensures every SmartCraft function passes through cleanly without data loss. It’s flexible enough to snake through narrow passages and sturdy enough to handle everyday vibration and movement.

Why Buy OEM

SmartCraft networking relies on accurate pin alignment and proper shielding. Mercury’s OEM extension harness preserves signal quality and fits securely, preventing the loose connections and intermittent faults common with aftermarket pieces. The factory build ensures long-term reliability and cleaner diagnostics down the road.

FAQ

Q1: When should I use this 3-foot extension?
Whenever a SmartCraft connector needs a little more distance to reach a junction box or helm connection.

Q2: Does the extension affect SmartCraft data?
No. The fully populated 10-pin design maintains clean CAN communication.

Q3: Can this be used with any SmartCraft device?
Yes. It supports any connection that uses a standard 10-pin SmartCraft plug.

Q4: Is installation difficult?
No. It plugs inline with the existing harness and routes like any other cable.

Q5: Is it suitable for saltwater boats?
Yes. The OEM cable jacket and connectors are built for long-term marine use.