Freightliner Electrical Wiring Diagrams and Schematic Diagrams

Circuit diagramthe location of the connectors on the framecable arrangement of sensor connectors on the engine

Vehicle identification

Car access

Electrical system

Instruments and controls

Governing bodies

Seats and restraints

Climate control

Cab specifications

Mercedes-Benz engines

Detroit Diesel engines

Caterpillar engines

Air brake system

Engine brake Manual gearboxes and hydraulic clutch

SmartShift Freightliner automated gearboxes

Bridges

Steering

Fontaine fifth wheel coupling

Coupling device for Holland trailer

Headlight adjustment

General specifications

General Maintenance Information

Clutch

Transmission

Frame and its components

Suspension

Front axle

Rear axle

Cardan drive

Brake system

Steering

Exhaust system

Heater and air conditioning

Wheels and tires

Freightliner Wiring Diagrams

The Freightliner wiring diagrams are divided by system function. This allows

for many different options or accessory systems to be installed on the same

model truck. Examples for this section are drawn from the diagram below


Checking and cleaning the trailer cable one.

Disconnect the trailer electrical cables from the outlets in the cab.

2.

Inspect the cables and connectors for corrosion and clean if necessary. If the outlet is too corroded to clean, replace it. Freightliner also recommends replacing the wiring harness of the outlet if corrosion has entered the wires and connectors inside the outlet.

IMPORTANT: When using an aerosol cleaner to remove corrosion, be careful to protect any surrounding painted surfaces.

3.

Apply lithium-based dielectric grease to the inside of the connectors, such as Lubriplate FLP DS-ES.

four.

Connect the cables.