Dorman 904-090 Diesel Glow Plug Wiring Harness

Dorman 904-090 Glow Plug Harness

Restore reliable diesel cold-start performance with this Dorman diesel glow plug wiring harness. Built to match the original equipment fit and function, it is made with durable materials for dependable electrical connection in 2002-2004 Volkswagen Golf and 2002-2004 Volkswagen Jetta applications.

Key Features

• Direct replacement glow plug wiring harness for diesel secondary ignition systems
• Specific fit for 2002-2004 Volkswagen Golf and 2002-2004 Volkswagen Jetta
• Black harness with 63-inch length and 0.5-inch outside diameter
• 4-terminal design with male blade terminals
• Copper conductor and 16 AWG wire for consistent current transfer
• Plastic cable jacket, plastic insulator, and rubber/EPDM boot materials for durability
• Cross-reference: Genuine 038971220C

Detailed Description

The Dorman 904-090 glow plug wiring harness is a specific-fit replacement for diesel engines that need a dependable connection between the glow plug circuit and the vehicle’s electrical system. It is engineered to match the original harness layout and uses copper wire core material, copper/steel terminals, and black rubber-style boots to support stable performance in demanding underhood conditions. This part number, 904-090, is a practical choice for Volkswagen Golf and Volkswagen Jetta diesel owners looking for an OE-style replacement harness.

Compatible With 2002-2004 Volkswagen Golf and 2002-2004 Volkswagen Jetta, this harness addresses common secondary ignition wiring wear points without changing the original routing or connection style. The 4-wire, 16 AWG construction and blade terminal design help maintain a secure electrical interface at the glow plugs.

Common Issues This Part Can Help Solve

• Diesel hard-start or no-start conditions during cold weather
• Check engine light related to glow plug circuit faults
• Intermittent glow plug electrical connection
• Damaged, brittle, or heat-aged harness wiring
• Voltage loss caused by worn terminals or insulation breakdown

Installation Notes and Tips

Verify the vehicle’s original harness routing, connector style, and terminal count before installation. Inspect the glow plugs and related connectors for corrosion or heat damage, and replace any compromised components as needed to ensure a solid electrical connection. Confirm fitment for 2002-2004 Volkswagen Golf and 2002-2004 Volkswagen Jetta before ordering.

Quality Assurance

Dorman manufactures this replacement harness to match the fit and function of the original equipment part using quality materials for durability and reliable performance. Part number 904-090 is built as a direct replacement for the listed Volkswagen diesel applications.