21-Pin White Connector Pigtail Repair Kit – Kenworth & Freightliner

21-Pin Firewall Connector Repair Kit

The 21-pin firewall connector repair kit is designed to replace damaged or missing firewall harness connectors found in Kenworth and Freightliner trucks. If your OEM connector has been cut, corroded, or damaged, this kit provides a reliable and cost-effective solution without replacing the entire wiring harness.

Commonly searched as:

• 21 pin firewall connector Kenworth

• Freightliner 21 pin firewall connector repair

• 21 pin bulkhead connector

• Firewall harness connector replacement

• 21 pin ECU firewall pigtail

This repair kit helps restore secure electrical connections at the firewall while saving time and money compared to full OEM harness replacement.

What’s Included in the Kit

• 1x 21-Position Connector Housing

• 1x Top Cover

• 21x Pre-Crimped Wires with Weather Seal (1 ft each)

Each wire is pre-crimped with the correct terminal and includes a weather seal for added protection against moisture, vibration, and contaminants. Wire color may vary depending on production batch.

ECU is NOT included. This kit is intended for harness repair only.

Designed for Firewall & Bulkhead Harness Repair

This 21 pin firewall connector repair kit is commonly used for:

• Kenworth firewall connector replacement

• Freightliner firewall harness repair

• Bulkhead connector restoration

• Replacing cut or damaged ECU firewall connectors

Instead of sourcing a complete OEM firewall harness assembly, this kit allows technicians to repair only the affected connector section.

Built for Heavy-Duty Truck Environments

Heavy-duty trucks operate under extreme vibration, heat, and environmental exposure. This kit is designed to withstand those conditions, offering:

• Weather-sealed terminals

• 1-foot wire leads for flexible routing

• Secure top cover for proper connector protection

• Durable OEM-style housing

Whether you are a professional diesel technician or performing your own truck repair, this kit simplifies firewall connector restoration while maintaining long-term reliability.

Comprehensive Return and Warranty Policy for Your Peace of Mind

At Diesel Electronic Supply, our Return and Warranty Policy ensures that you can shop confidently knowing that your satisfaction is our top priority. We accept returns and exchanges for unused, uninstalled, and undamaged products, safeguarding your investment with easy-to-follow procedures.

Whether you're a DIY enthusiast or a professional, our policy is designed to make your shopping experience seamless and worry-free:

• Flexible Returns: Request a return within 7 days for a full refund (minus a 25% restocking fee).
• Store Credit after 7 Days: If you miss the return window, store credit may be issued upon approval.
• No Hidden Costs: Original shipping is non-refundable, and customers cover return shipping.
• Clear Warranty Coverage: Enjoy a 6-month warranty on our products against defects in materials and workmanship.

Need to return an item? Simply email us at support@dieselelectronicsupply.com with your order number and reason for the return. Remember, all returns must be authorized before sending them back!

We believe in transparency and customer satisfaction, which is why our detailed return policy addresses numerous scenarios, ensuring you know exactly what to expect. Shop with us and experience reliable products that come with a promise of quality and support.