Engine Wiring Harness for 7.3L Powerstroke 2002-2003 Ford F250
EGR Performance Engine Wiring Harness 7.3L Powerstroke F350 2003
2002-2003 Ford 7.3L Powerstroke Engine Wiring Harness (F81Z-12B637-FA)
Premium Engine Wiring Harness for Ford F250 F350 7.3L 2002-2003
EGR Direct Replacement Wiring Harness 7.3L Powerstroke 2002-2003 Ford
Engine Wiring Harness for 7.3L Powerstroke 2002-2003 Ford F250
EGR Performance Engine Wiring Harness 7.3L Powerstroke F350 2003
2002-2003 Ford 7.3L Powerstroke Engine Wiring Harness (F81Z-12B637-FA)
Premium Engine Wiring Harness for Ford F250 F350 7.3L 2002-2003
EGR Direct Replacement Wiring Harness 7.3L Powerstroke 2002-2003 Ford

Engine Wiring Harness for 7.3L Powerstroke Ford F250 F350 (2002-2003) Replace F81Z-12B637-FA

$175.79
Shipping calculated at checkout.
81 in stock, ready to ship
🛒 Bulk Discount: Save 6% on 2+ Items
🎁 Special Offer: Enjoy 10% Off on 3+ Items
📞 Large Orders (10+): Contact Us for Exclusive Deals
Details

Engine Wiring Harness for 7.3L Powerstroke 2002-2003 Ford F250 F350 – Manufactured by EGR Performance, this direct replacement harness (core part number: F81Z-12B637-FA) features high-quality insulating materials and nylon braided layer. All parts undergo double hand inspection, with integrated power wire for efficient power transmission. Backed by a 1-year warranty, it’s tailored for 2002-2003 Ford models with 7.3L diesel engine, automatic transmission and without California emissions, with professional support at service@egrperformance.com.

Model Year
Vehicle Model
Engine
Replacement Part Numbers
2002-2003
Ford F-250 Super Duty
7.3L V8 Diesel Engine
F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
2002-2003
Ford F-350 Super Duty
7.3L V8 Diesel Engine
F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
2002-2003
Ford F-450 Super Duty
7.3L V8 Diesel Engine
F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
2002-2003
Ford F-550 Super Duty
7.3L V8 Diesel Engine
F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
2002-2003
Ford Excursion
7.3L V8 Diesel Engine
F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637

 
Shipping Details

Ontario CA / Springdale OH / Newark NJ
Package List
Delivery Time

2-5 working days inland in the United States
Attention
Legal Disclaimer EGR DPF Delete Offroad Use Only

LEGAL DISCLAIMER

This product may NEVER be installed on a vehicle registered for highway or public street use. By installing this product onto your vehicle, you assume all risk and liability associated with its use. It is your responsibility to make sure your vehicle complies with all federal, state, and local emissions laws.

Federal and many state and local laws prohibit the removal, modification or rendering inoperative of any part of the design affecting emissions or safety on motor vehicles used on a public street or highway. Violation may result in a fine of up to $32,500 per vehicle (or possibly higher depending on changes in the law). All civil penalties and fines for removing your vehicle's emissions equipment are the sole responsibility of the end user.

No other applications besides off-road competition racing use are intended or implied. Depending on where you live, additional restrictions may apply. Check all applicable laws before installing or using.

Not available for sale or use in the state of California, Colorado and Arizona.

Product details

Product Overview

The EGR Performance Engine Wiring Harness is a precision-engineered direct replacement exclusively designed for 2002-2003 Ford diesel vehicles equipped with the 7.3L V8 engine. Key highlights:

  • Directly replaces multiple OEM part numbers: F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
  • Compatible with 2002-2003 Ford F-250/F-350/F-450/F-550 Super Duty and Excursion
  • Critical fitment restrictions: 7.3L V8 Diesel Engine, Automatic Transmission, and Without California Emissions
  • Premium construction: High-quality insulating materials and nylon braided layer for durability and efficient performance
  • Strict quality control: All parts are hand inspected off the production line and rechecked before shipment
  • Functional advantages: Integrated power wire and charge harness, enabling quick power transmission and supply
  • Restores reliable electrical communication between engine components, resolving issues from worn or faulty OEM harnesses

This harness is tailored to meet the exact electrical specifications of 2002-2003 7.3L Powerstroke automatic transmission models (non-California emissions), ensuring seamless integration and long-term reliability for daily driving, heavy-duty hauling, or towing.

Ideal For

This Engine Wiring Harness is perfect for owners of 2002-2003 Ford 7.3L Diesel models who:

  • Need to replace a damaged, corroded, or malfunctioning OEM harness with part numbers F81Z-12B637-FA, F81Z12B637FA or other compatible part numbers
  • Own 2002-2003 Ford F-250/F-350/F-450/F-550 Super Duty or Excursion with 7.3L V8 Diesel Engine
  • Have vehicles equipped with Automatic Transmission and Without California Emissions
  • Seek a high-quality wiring solution with durable insulating materials and nylon braided protection
  • Value strict quality control (double hand inspection) for reliable performance
  • Require a direct-fit replacement to avoid modification or wiring splicing
  • Want reliable engine electrical performance backed by a 1-year warranty from EGR Performance
  • Need to verify vehicle compatibility or OE number before purchase (contact our customer service for assistance)

Core Advantages

Premium Material & Durable Construction

  • High-Quality Materials: Made with top-grade insulating materials and nylon braided layer, resisting under-hood heat, vibration, moisture, and corrosion
  • Efficient Power Transmission: Integrated power wire and charge harness design ensures quick power transmission and stable power supply to engine components
  • Long-Term Reliability: Durable build withstands harsh operating conditions, reducing the need for frequent replacements

Strict Quality Control & Trustworthy Performance

  • Double Hand Inspection: All parts are inspected off the production line and rechecked by our team before shipment, ensuring zero defects and consistent quality
  • 100% Functional: Undergoes strict performance testing to ensure it meets or exceeds OEM standards for electrical conductivity and fitment

Precision Fitment for 2002-2003 Specific Models

  • Multi-Part Number Compatibility: Directly replaces F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637 – covers multiple OEM part variations
  • Clear Fitment Guidelines: Explicitly designed for 2002-2003 models with 7.3L diesel engine, automatic transmission, and non-California emissions, eliminating fitment guesswork
  • Seamless Integration: Matches the original harness’s connector positions and wiring layout, ensuring direct attachment to existing engine components (no modifications needed)

Trusted Brand & Comprehensive Support

  • 1-Year Warranty: Backed by EGR Performance’s 1-year warranty, covering manufacturing defects and quality issues
  • Dedicated Customer Service: Professional support available via service@egrperformance.com for compatibility verification, OE number checking, and installation guidance

Technical Specifications

  • Brand: EGR Performance
  • Product Name: Engine Wiring Harness
  • Replacement Part Numbers: F81Z-12B637-FA, F81Z12B637FA, 12B637, 1837761C91, P659932, SWF-12B637
  • Condition: Brand New
  • Compatible Year: 2002-2003
  • Compatible Vehicles: Ford F-250/F-350/F-450/F-550 Super Duty, Ford Excursion
  • Compatible Engine: 7.3L V8 Diesel Engine
  • Compatible Transmission: Automatic Transmission (not for manual)
  • Emission Restriction: Without California Emissions
  • Material: High-quality insulating materials + nylon braided layer
  • Key Features: Double hand inspection, integrated power wire & charge harness, quick power transmission, direct replacement
  • Installation Recommendation: Professional installation is highly recommended
  • Installation Instructions: Not Included (support via service@egrperformance.com)
  • Warranty: 1-Year Warranty from EGR Performance

Why Choose This EGR Performance Engine Wiring Harness?

For owners of 2002-2003 Ford 7.3L Diesel models (automatic transmission, non-California emissions), this harness is the top replacement choice – here’s why:

  • Targeted Fitment for Your Exact Truck: Exclusively engineered for 2002-2003 7.3L Diesel Super Duty (F250-F550) and Excursion, with clear restrictions on transmission and emissions, ensuring perfect fit without compatibility issues
  • Premium Quality You Can Rely On: High-quality insulating materials, nylon braided layer, and double hand inspection guarantee durability, efficient performance, and zero defects
  • Multi-Part Number Compatibility: Covers 6 OEM part numbers, making it a versatile replacement solution for different part number variations of the same harness
  • Functional Advantages for Optimal Performance: Integrated power wire and charge harness enable quick power transmission, ensuring stable engine operation even in heavy-duty use
  • Hassle-Free Direct Replacement: Matches the original harness exactly, requiring no cutting, splicing, or modifications – saving time and effort on installation (professional recommended)
  • Trusted Warranty & Support: 1-year warranty and responsive customer service provide peace of mind, with assistance available for compatibility and OE number verification

Complete Package Contents

Included:

  • 1 x Complete EGR Performance 7.3L Diesel Engine Wiring Harness

Not Included:

  • Installation instructions (support available at service@egrperformance.com)
  • Tools for harness removal/installation
  • Additional hardware or connectors (uses existing OEM mounting points and connectors)

Compatibility List

Compatible Vehicles (2002-2003, 7.3L V8 Diesel, Automatic Transmission, Without California Emissions):

  • 2002 Ford F-250 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2002 Ford F-350 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2002 Ford F-450 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2002 Ford F-550 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2002 Ford Excursion 7.3L V8 Diesel Automatic Transmission
  • 2003 Ford F-250 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2003 Ford F-350 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2003 Ford F-450 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2003 Ford F-550 Super Duty 7.3L V8 Diesel Automatic Transmission
  • 2003 Ford Excursion 7.3L V8 Diesel Automatic Transmission

Non-Compatible Vehicles:

  • 2002-2003 Ford 7.3L Diesel modelswith California Emissions
  • 2002-2003 Ford 7.3L Diesel models with Manual Transmission
  • Ford models outside 2002-2003
  • Non-7.3L V8 Diesel engine configurations
  • Ford trucks not listed in the compatible vehicles section (e.g., F-150, Ranger)
  • Vehicles requiring part numbers not listed in the compatible replacement part numbers
  1. Dispatch Time: Orders will be shipped within 24 hours after successful payment.
  2. Delivery Time: 2-5 business days after dispatch (delivery speed depends on proximity to warehouse location).
  3. Return Window:7 days for unsatisfactory items45 days for quality-related issues
  4. Refund Processing: Refunds will be processed back to your original payment method within 2-4 business days after receiving the automated refund confirmation email (subject to bank verification).

Does this harness fit my 2003 Ford F-350 Super Duty 7.3L Diesel with automatic transmission and without California emissions?

Yes. This EGR Performance Engine Wiring Harness is specifically designed for 2002-2003 Ford F-350 Super Duty models equipped with the 7.3L V8 Diesel Engine, Automatic Transmission, and Without California Emissions. It directly replaces OEM part number F81Z-12B637-FA and other compatible part numbers, ensuring perfect fit and functionality.

Will this harness work with my 2002 Ford Excursion 7.3L Diesel with California emissions?

No. This harness is only compatible with 2002-2003 Ford 7.3L Diesel models Without California Emissions. It will not fit models with California Emissions – please confirm your vehicle’s emission type before purchase. For compatibility verification, you can contact us at service@egrperformance.com with your vehicle’s details.

Can this harness replace OEM part number 1837761C91?

Yes. This wiring harness is a direct replacement for multiple OEM part numbers, including 1837761C91, F81Z-12B637-FA, F81Z12B637FA, 12B637, P659932, and SWF-12B637. It matches the original part’s specifications exactly, making it a seamless swap for any of these part numbers.

Is professional installation really necessary for this harness?

We highly recommend professional installation. Installing an engine wiring harness involves disconnecting the battery, removing old harness fasteners, disconnecting electrical connectors, and ensuring all new connectors are properly seated – tasks that require specialized knowledge of 2002-2003 7.3L Powerstroke electrical systems. Installation instructions are not included, but our team can provide guidance via service@egrperformance.com.

What quality control measures are taken for this wiring harness?

All parts of this EGR Performance Engine Wiring Harness undergo double hand inspection: first off the production line before packaging, and again by our quality control team before shipment. This strict inspection process ensures zero defects, consistent quality, and reliable performance for your 7.3L Powerstroke truck.

Does this harness come with installation instructions?

No. Installation instructions are not included with the package. However, our dedicated customer service team is available to provide installation guidance and answer any fitment or OE number verification questions. For assistance, please contact us at service@egrperformance.com.

What is covered by the 1-Year Warranty from EGR Performance?

The 1-Year Warranty covers manufacturing defects and quality issues for the 7.3L Powerstroke Engine Wiring Harness. It ensures the harness meets EGR Performance’s premium standards for fitment, durability, and electrical performance. The warranty does NOT cover damage from improper installation, misuse, accidental damage, or normal wear and tear. For warranty claims, contact service@egrperformance.com.

Does this harness have an integrated power wire?

Yes. This EGR Performance Engine Wiring Harness features anintegrated power wire and charge harness, which enables quick power transmission and stable power supply to your 2002-2003 7.3L Diesel engine’s components, ensuring optimal performance.

How can I verify if this harness fits my vehicle before purchasing?

To ensure compatibility, please double-check your vehicle’s: 1) Model year (2002-2003), 2) Engine (7.3L V8 Diesel), 3) Transmission (Automatic), 4) Emission type (Without California Emissions), and 5) OEM part number (must be one of the compatible part numbers listed). If you’re unsure, email your vehicle’s details and OE number to service@egrperformance.com, and we’ll verify compatibility for you.

Will this harness fit my 2003 Ford F-550 Super Duty 7.3L Diesel with manual transmission?

No. This harness is exclusively compatible with 2002-2003 Ford 7.3L Diesel models with Automatic Transmission. It will not fit models with manual transmission – please confirm your vehicle’s transmission type before purchase.

Warranty & Support

All EGR Performance Engine Wiring Harnesses for 2002-2003 Ford 7.3L Diesel (Automatic Transmission, Without California Emissions) come with a 1-Year Warranty covering manufacturing defects and quality issues. We recommend professional installation for optimal performance. Please double-check your vehicle’s compatibility and OE number before purchasing; if you need assistance, contact our customer service team at service@egrperformance.com for compatibility verification, OE number checking, or installation guidance. Note: Installation instructions are not included.