Mercury – 5-Pin NMEA 2000 / CAN H Extension Harness | 7 m | 84-879171T08

Overview
Boat layouts rarely make wiring easy, and sometimes the sensor you need to mount ends up much farther from the backbone than you expected. The Mercury 84-879171T08 Extension Harness gives you seven full meters of extra reach, which is a nice sweet spot for bigger consoles or longer runs along the gunwale. It gives your GPS or IMU some breathing room so you can put it in the right spot without stretching or forcing the cable.

Key Features

• 7-Meter Extension – Plenty of length for longer rigging paths without being excessive.
• Standard 5-Pin Micro-C – Works with both NMEA 2000 and Mercury CAN H devices.
• Sensor-Friendly Layout – Great for relocating GPS or IMU modules to a clearer mounting area.
• Flexible Marine Cable – Handles tight bends and everyday movement behind panels.
• Simple Plug-In Connection – No cutting, no adapters—just connect it and route it cleanly.

Compatibility

• NMEA 2000 Micro-C networks
• Mercury CAN H bus
• IMU modules, GPS antennas, heading sensors

Performance & Practical Benefits
This harness helps you route a sensor cable the way you wish the boat had been designed—smoothly, with no strain and no awkward angles. The extra length means you can tuck the wiring where it’s safe and out of sight, all while keeping the connection tight and the data flowing the way it should. Once in place, everything works just like before—only now the install looks cleaner and feels more intentional.

Why Buy OEM
When you’re dealing with a live data line, cheap connectors aren’t worth the trouble. Mercury’s OEM plugs stay locked in place, keep water out, and maintain solid contact even when the boat is taking a pounding. Aftermarket versions usually don’t hold up as well, and loose-fit connectors can cause the kind of glitches that are a pain to track down later.

FAQ
Q1: Can this be used with any NMEA 2000 device?
Yes—it uses the standard Micro-C connector.

Q2: Does it reduce GPS or IMU accuracy?
No. Seven meters is well within the safe run distance for clean N2K and CAN H signals.

Q3: Is the cable stiff?
No—the jacket is flexible enough to run around corners and through tight spaces.

Q4: Will this work with SmartCraft gateways?
Yes—if they use a 5-pin Micro-C port.

Q5: Does it need any calibration or setup?
No. It’s strictly an extension cable.