Description: Marine Diesel View Display Harness
Brand: Cummins®
Condition: New
Part Number: 3976917
Vehicle Fitment 3976917:
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1. Compatible Engines
This harness is primarily designed for Cummins Marine propulsion engines equipped with Quantum System (QS) electronics. This includes, but is not limited to:
2. System Compatibility
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Display Type: Works with the SmartCraft® DieselView LCD monitors.
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Protocol: Designed for J1939 CAN bus communication.
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Application: Specifically for marine environments (saltwater and freshwater vessels) featuring corrosion-resistant connectors.
3. Key Features
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Plug-and-Play: Uses OEM connectors for a secure, moisture-sealed fit.
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Multi-Station Support: Often used in configurations involving flybridge and main cabin dual-station setups.
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A Marine DieselView Display Harness 3976917 is a dedicated communication cable that acts as the "nervous system" between a Cummins marine engine and the DieselView digital monitoring screen.
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1. Purpose
This harness transmits vital engine data—such as RPM, oil pressure, coolant temperature, fuel burn, and diagnostic fault codes—from the engine's Engine Control Module (ECM) to the helm station display.
2. Technology
It is built to support the SmartCraft® protocol and J1939 CAN bus communication. Because it is a "Marine" grade part, the harness features:
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Gold-plated or tin-plated pins to prevent corrosion from salt air.
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Heavy-duty jacketing to resist heat, oil, and vibration found in engine rooms.
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Watertight connectors (often Deutsch or Amphenol style) to ensure the signal isn't interrupted by moisture.
3. Components
A typical kit may include the backbone cable, T-junctions, and terminating resistors required to complete the data network between the engine and the dashboard.
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Signs of Faulty 3976917:
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1. Intermittent Data or "Ghost" Readings
The screen may flicker, or engine data (like RPM or Temp) might suddenly drop to zero and then return to normal. This usually indicates a loose pin or a break in the internal wire caused by engine vibration.
2. "Communication Lost" or "No Data" Errors
If the DieselView display stays powered on but shows a "Data Link Disconnected" or "No Engine Communication" message, the J1939 CAN bus wires inside the harness are likely broken or corroded.
3. Corrosion at the Connectors
If you unplug the harness and see green or white powdery residue (oxidation) on the pins, moisture has breached the seal. This creates high resistance and prevents the digital signal from reaching the display.
4. Blown Fuses or Screen Power Issues
A short circuit within the harness jacket—often caused by the wires rubbing against a sharp metal edge in the engine room—can cause the system fuse to blow repeatedly or prevent the screen from turning on at all.
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Manufacturer information
Cummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.
Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.
