Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Mercury SmartCraft Fuel Paddle Harness, model 84-8M0075945. This harness is designed to integrate a fuel paddle sensor with the Mercury SmartCraft system, enabling accurate fuel level monitoring and data transmission to compatible marine engine displays and systems.

Setup and Installation
The Mercury SmartCraft Fuel Paddle Harness facilitates the connection between a fuel paddle sensor and your boat's SmartCraft network. Proper installation is crucial for accurate fuel data readings.
- Preparation: Ensure the boat's power is disconnected before beginning any electrical work. Gather necessary tools, including wire strippers, crimpers, and marine-grade connectors if modifications are required.
- Identify Components: Locate the fuel paddle sensor on your fuel tank and the SmartCraft junction box or compatible connection point on your engine or helm.
- Connect to Fuel Paddle Sensor: Connect the appropriate end of the harness to the fuel paddle sensor. Ensure a secure and watertight connection.
- Route Harness: Carefully route the harness through the boat, avoiding sharp edges, moving parts, and sources of excessive heat. Use cable ties to secure the harness at regular intervals.
- Connect to SmartCraft System: Connect the other end of the harness to the designated port on your SmartCraft network. This connection is typically a multi-pin connector designed for marine environments. Refer to your engine's or SmartCraft system's service manual for the exact connection point for fuel gauge integration.
- Verify Connections: Double-check all connections for tightness and proper insulation. Restore power to the boat and test the fuel gauge functionality through your SmartCraft display.

Warning: If you are unsure about any step of the installation process, it is highly recommended to seek assistance from a qualified marine technician.
Operating Instructions
Once correctly installed, the Mercury SmartCraft Fuel Paddle Harness operates automatically. It continuously transmits fuel level data from the fuel paddle sensor to your SmartCraft compatible gauges and displays. No user interaction is required for its basic function.
- Ensure your SmartCraft display is powered on to view fuel level information.
- Calibrate your fuel gauge or SmartCraft system according to your engine or display unit's instructions, if necessary, to ensure accurate readings.
Maintenance
Regular inspection and basic maintenance can prolong the life and ensure the reliability of your fuel paddle harness.
- Visual Inspection: Periodically inspect the entire length of the harness for any signs of wear, chafing, cuts, or damage to the outer insulation.
- Connection Integrity: Check all connections for corrosion, looseness, or signs of water intrusion. Ensure all connectors are fully seated and locked.
- Corrosion Prevention: In marine environments, apply a marine-grade dielectric grease to electrical connections to prevent corrosion.
- Cleaning: Keep the harness and connectors clean and free of dirt, salt, and debris. Use a mild cleaner and rinse with fresh water, ensuring no moisture enters the connectors.
Troubleshooting
If you experience issues with your fuel gauge readings or the SmartCraft system, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Inaccurate/No Fuel Reading | Loose or corroded connections Faulty fuel paddle sensor Incorrect SmartCraft system calibration Damaged harness wiring | Check and secure all connections. Clean any corrosion. Test the fuel paddle sensor (refer to sensor manual). Recalibrate the SmartCraft fuel gauge. Inspect harness for damage; replace if necessary. |
| Intermittent Readings | Vibration causing loose connections Partial wiring damage | Ensure all connections are tightly secured and harness is properly routed and fastened. Inspect harness for subtle damage; consider professional inspection. |
| SmartCraft System Error | Harness not fully compatible Software issue in SmartCraft display | Verify harness compatibility with your specific SmartCraft system and engine model. Consult your SmartCraft display manual for error codes and software troubleshooting. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | 84-8M0075945 |
| Brand Compatibility | Mercury, Mercruiser, Quicksilver (SmartCraft systems) |
| Engine Position | Outboard |
| Fuel Type Compatibility | Gasoline |
| Condition | New |
| Approx. Package Length | 16 cm |
| Approx. Package Width | 16 cm |
| Approx. Package Height | 12 cm |
| Approx. Package Weight | 1.2 kg |
User Tips
- Engine Compatibility: Always verify the harness's compatibility with your specific Mercury engine model and year (e.g., Mercury 115 Pro XS 2022) before installation to ensure proper function.
- Consult Manuals: For precise connection points for the fuel gauge and SmartCraft system, refer to your specific Mercury engine's service manual or the SmartCraft system's installation guide.
- Professional Installation: If you are not experienced with marine electrical systems, consider having the harness installed by a certified marine technician to prevent damage and ensure safety.
Warranty and Support
For warranty information, please refer to the documentation provided by the original manufacturer or your point of purchase. Keep your proof of purchase for any warranty claims.
For technical support or further assistance, please contact the manufacturer's customer service or a certified Mercury marine dealer.





