Freightliner Trucks is the largest truck manufacturer in North America, so it is no surprise that customers often look for wiring diagrams for their trucks. This includes the most popular models, such as the Freightliner Cascadia, Freightliner Columbia, and the Freightliner M2. Unfortunately, Freightliner doesn’t make it easy for their customers to get access to technical information such as wiring diagrams.

Ease of Use

Our platform not only includes Freightliner wiring diagrams but also diagrams for other truck manufacturers and models as well. Making the wiring diagrams have the same look and feel across both models and manufacturers is essential since it allows your technicians to be more efficient. For example, you’ll see the same symbols on this Freightliner Cascadia wiring diagram for front turn signal lamps used across other manufacturers.

Whenever possible, we make sure to color code the wiring diagrams to match the actual colors of the wire on the vehicle itself, which often exceeds what the OEM wiring diagrams look like. This is an example of a Freightliner Cascadia trailer receptacle wiring.


Users of Diesel Repair using the Wiring Diagrams module have no such problem. You will be able to find Freightliner Wiring Diagrams for all the common systems, such as:

  • Air Conditioning
  • Anti-Lock Brake System (ABS)
  • Computer Data Lines (CAN Bus)
  • Cooling Fan
  • Cruise Control
  • Electronic Suspension
  • Engine Accessories
  • Engine Performance
  • Exterior Lights
  • Headlights
  • Horn
  • Instrument Cluster
  • Interior Lights
  • Pneumatic Systems
  • Power Distribution
  • Power Door Locks
  • Power Mirrors
  • Power Windows
  • Radio
  • Starting & Charging System
  • Supplemental Restraints
  • Trailer Harness
  • Washer & Wiper System

You can also find all the Freightliner wiring diagrams for the engines used through the years. This includes the following:

Caterpillar Wiring Diagrams for Freightliner Models:

  • 3126
  • 3176
  • 3306
  • 3176B
  • 3406E
  • C7
  • C9
  • C10
  • C12
  • C13
  • C15
  • C16

Cummins Wiring Diagrams for Freightliner Models:

  • B6.74
  • B6.7N
  • C8.3
  • C8.3E
  • ISB3.9
  • ISB5.7
  • ISB6.7
  • ISC
  • ISC8.3
  • ISL
  • ISL9
  • ISL-G
  • ISM, ISX
  • ISX11.9
  • ISX12
  • ISX15
  • L9
  • L10
  • M11
  • N14
  • X12
  • X15

Detroit Diesel Wiring Diagrams for Freightliner Models:

  • DD5
  • DD8
  • DD13
  • DD15
  • DD16
  • Series 60

Mercedes-Benz Engines (MBE) for Freightliner Models:

  • MBE900
  • MBE4000


Freightliner wiring diagrams can be hard to find, but we have them inside Diesel Repair. You can book a demo or create your account and get started immediately. The Diesel Repair platform also has other valuable information for Freightliner Trucks, such as diagnostic fault code (DTC) repair information, recalls, technical service bulletins (TSBs), component locators, labor time guides, remove & replace instructions, and much more.