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Freightliner

OEM LED Headlight Wiring Harness - Freightliner Cascadia 2018-2025 - A66-00114-000

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SKU: A66-00114-000
$164.24
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Fitment

Fits these trucks

Freightliner Cascadia (P4) 2018-2025LED headlamp, outline and marker lights, chassis sideConnects the LED headlamp and outline lighting to the chassis wiring
Always confirm your year, make & model before ordering.
Part numbers

OEM & interchange numbers

1 cross-ref
Freightliner A66-00114-000
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview

This is the genuine Freightliner OEM headlight wiring harness for the Cascadia LED headlight system, and it is the part most people get to last. A harness with chafed insulation, corroded pins or a cracked connector produces flickering lamps, intermittent function or a completely dead headlight โ€” the exact symptoms of a bad lamp or a bad control module, which is why both often get replaced first. We stock these right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

Fix the Circuit, Not the Symptom: The Cascadia Headlight Harness Advantage

This harness carries power and signal to the headlight assembly from the chassis side of the circuit, feeding the LED headlamp, outline and marker lights together. When the lamp and the control module both test good and the fault still comes and goes with road vibration or weather, the wiring between them is what is left โ€” and a green, brittle pin cannot be fixed by cleaning it one more time.

Replacing the harness restores a clean connection instead of patching individual wires, so you are not stacking butt connectors and heat shrink in a wet, exposed area that will fail again next winter. Because it is the OEM part it arrives with the correct connectors out of the box, with no splicing into the factory loom and no guessing at pin assignments. Order it by the Freightliner number A66-00114-000.

Vehicle Fitment & Compatibility

This genuine OEM headlight harness is intended for the following commercial application:

  • Make/Model: Freightliner Cascadia (P4), 2018-2025
  • Application: LED headlamp, outline and marker lights, chassis side
  • Function: Carries power and signal to the headlight assembly
  • Installation: Correct connectors out of the box, no splicing into the factory loom
  • Component Group: Exterior Lighting / Headlights & Fog Lights

Direct Replacement & Cross-Reference Numbers:

Order this genuine Freightliner headlight harness by the following part number:

  • Freightliner OEM #: A66-00114-000

Technical Specifications

  • Component Type: Headlight Wiring Harness
  • Application: LED headlamp, outline and marker lights, chassis side
  • Function: Carries power and signal to the headlight assembly
  • Fitment: Freightliner Cascadia (P4) 2018-2025
  • Condition: New
  • Warranty: 1-Year FleetPro Warranty
  • Brand: Freightliner (Distributed by FleetPro Parts & Tires)
Key features
  • Genuine Freightliner OEM: The factory harness for the Cascadia LED headlight system, with the correct connectors out of the box.
  • No Splicing Required: Plugs into the factory loom instead of adding butt connectors and heat shrink in a wet, exposed area.
  • Feeds the Whole Front Corner: Carries power and signal to the LED headlamp, outline and marker lights from the chassis side.
  • Ends Intermittent Headlight Faults: Replaces chafed insulation, corroded pins and cracked connectors that cause flicker and dropouts.
  • Cheaper Than Chasing It: Restores a clean connection rather than patching one wire at a time and testing the same fault again.
Specifications
Component Type
Headlight Wiring Harness
Application
LED headlamp, outline and marker lights, chassis side
Function
Carries power and signal to the headlight assembly
Installation
Correct connectors out of the box, no splicing into the factory loom
Fitment
Freightliner Cascadia (P4) 2018-2025
Condition
New
Warranty
1-Year FleetPro Warranty
Questions
Will this fit my truck?
This part fits Freightliner Cascadia (P4) 2018-2025, LED headlamp, outline and marker lights, chassis side, Connects the LED headlamp and outline lighting to the chassis wiring. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Freightliner A66-00114-000.
How fast does it ship?
In-stock orders placed before 12 PM Central on business days ship the same day from our Hanover Park, IL warehouse, and typically arrive in 2 to 5 business days anywhere in the USA.
What's your return policy?
Unused items in original packaging can be returned within 30 days, backed by our 30-day money-back guarantee. If we ship the wrong part, we cover the return label and send the correct one.