Dorman 904-249 Diesel Glow Plug Wiring Harness - Left

Overview of Dorman Diesel Glow Plug Wiring Harness 904-249

The Dorman 904-249 Diesel Glow Plug Wiring Harness is designed specifically for Ford Excursion, F-250 Super Duty, and F-350 Super Duty models. This harness ensures reliable electrical connectivity for the glow plugs, supporting efficient cold starts in diesel engines.

• Length: 34.5 inches for precise fitment
• Color: Black for seamless integration
• Insulator Material: PTFE for high heat resistance
• Terminal Gender: Female with copper/steel construction
• Wire Core Material: Tinned copper for corrosion resistance
• Wire Gauge: AWG 14, 4-wire configuration
• Specific fit for select Ford diesel trucks

Technical Details and Construction

The Dorman 904-249 harness features a durable PTFE insulator material that withstands high temperatures commonly found in diesel engine compartments. The wiring harness includes four AWG 14 wires with tinned copper cores, providing excellent conductivity and resistance to corrosion. Female terminals made from copper and steel ensure secure connections to the glow plugs. Measuring 34.5 inches in length, this harness is engineered for a specific fit on Ford Excursion, F-250 Super Duty, and F-350 Super Duty models, ensuring proper routing and installation.

Compatible Vehicles and Applications

This diesel glow plug wiring harness is compatible with the following Ford models:

• Ford Excursion diesel engines
• Ford F-250 Super Duty diesel engines
• Ford F-350 Super Duty diesel engines

It is designed to replace worn or damaged wiring harnesses that can cause glow plug failure or poor engine starting performance.

Common Issues Addressed by This Harness

• Intermittent or no glow plug activation
• Corroded or damaged wiring connections
• Electrical shorts or open circuits in glow plug wiring
• Cold start difficulties in diesel engines
• Glow plug system faults triggering engine warning lights

Installation Notes and Tips

When installing the Dorman 904-249 harness, ensure the vehicle’s battery is disconnected to prevent electrical shorts. Verify the harness length and terminal orientation match the factory wiring. Use dielectric grease on terminals to prevent corrosion and ensure a secure connection. Follow the vehicle’s service manual for proper routing and securing of the harness to avoid contact with hot or moving engine parts.

Quality Assurance and Warranty

Dorman manufactures this diesel glow plug wiring harness to meet or exceed OEM specifications for fit, form, and function. The use of PTFE insulation and tinned copper wiring enhances durability and longevity under harsh engine conditions. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.