HomeEmission Control > Emission ComponentsStandard Ignition FWH103 Diesel Exhaust Fluid (DEF) Pump Wiring Harness
Part #: FWH103

Standard Ignition FWH103 Diesel Exhaust Fluid (DEF) Pump Wiring Harness

⚙️ 12 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$163.95Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Ford, F-250 Super Duty and F-350 Super Duty
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Standard Ignition Diesel Exhaust Fluid Pump Wiring Harness

The Standard Ignition FWH103 Diesel Exhaust Fluid (DEF) Pump Wiring Harness is designed specifically for Ford F-250 Super Duty and F-350 Super Duty models. This wiring harness ensures reliable electrical connectivity for the DEF pump system, supporting emission control components critical to diesel engine performance.

  • Connector Gender: Female and male
  • Connector Quantity: 5 connectors
  • Terminal Gender: Female and male
  • Terminal Quantity: 42 terminals
  • Terminal Type: Blade and pin terminals

Detailed Product Description

The FWH103 wiring harness from Standard Ignition is engineered to provide precise and durable connections for the Diesel Exhaust Fluid pump in Ford Super Duty trucks. Featuring a combination of female and male connectors and terminals, this harness accommodates five connectors and 42 terminals, utilizing blade and pin terminal types for secure and efficient electrical transmission. The design supports the complex wiring needs of emission control systems, ensuring proper DEF pump operation and compliance with emission standards.

Applications and Problem Resolution

This wiring harness is compatible with Ford F-250 Super Duty and F-350 Super Duty models, making it a direct replacement part for emission control system repairs or upgrades. It addresses several common issues, including:

  • Intermittent or failed DEF pump operation due to wiring faults
  • Corroded or damaged connectors causing electrical interruptions
  • Loose or worn terminals leading to poor signal transmission
  • Emission system fault codes triggered by wiring harness failures
  • Electrical shorts or open circuits within the DEF pump wiring

Installation Notes and Tips

When installing the Standard Ignition FWH103 wiring harness, ensure the vehicle battery is disconnected to prevent electrical hazards. Carefully match the female and male connectors to their corresponding counterparts on the DEF pump and vehicle wiring. Verify that all 42 terminals are securely seated and that blade and pin terminals are properly aligned to avoid connection issues. Inspect the harness routing to prevent pinching or exposure to heat sources that could degrade the wiring over time.

Quality Assurance and Warranty

Standard Ignition manufactures the FWH103 wiring harness to meet OEM specifications for fit, form, and function. The product undergoes rigorous quality control to ensure durability and reliable performance in demanding diesel emission control applications. While specific warranty details may vary, Standard Ignition typically offers coverage against manufacturing defects to provide confidence in the product's longevity and reliability.

BrandStandard Ignition
Part NumberFWH103
Connector GenderFemale + Male
Terminal GenderFemale + Male
Terminal TypeBlade & Pin

This part fits 12 vehicles. Search below:

YearMakeModelBody TypeLitersCylindersPositionNotes
2019FordF-250 Super Duty6.7LV8N/A
2019FordF-350 Super DutyCrew Cab Pickup6.7LV8N/A
2019FordF-350 Super DutyExtended Cab Pickup6.7LV8N/A
2019FordF-350 Super DutyStandard Cab Pickup6.7LV8N/A
2018FordF-250 Super Duty6.7LV8N/A
2018FordF-350 Super DutyCrew Cab Pickup6.7LV8N/A
2018FordF-350 Super DutyExtended Cab Pickup6.7LV8N/A
2018FordF-350 Super DutyStandard Cab Pickup6.7LV8N/A
2017FordF-250 Super Duty6.7LV8N/A
2017FordF-350 Super DutyCrew Cab Pickup6.7LV8N/A
2017FordF-350 Super DutyExtended Cab Pickup6.7LV8N/A
2017FordF-350 Super DutyStandard Cab Pickup6.7LV8N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

850-11673DFH103EFW203HC3Z14407A

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.