Instruments and controls
Seats and restraints
Detroit Diesel engines
Air brake system
Engine brake Manual gearboxes and hydraulic clutch
SmartShift Freightliner automated gearboxes
Fontaine fifth wheel coupling
Coupling device for Holland trailer
General Maintenance Information
Frame and its components
Heater and air conditioning
Wheels and tires
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.
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.
Apply lithium-based dielectric grease to the inside of the connectors, such as Lubriplate FLP DS-ES.
Connect the cables.
david beneduci (Friday, 02 June 2023 00:06)
I need complete wiring diagram of firewall for FLD 120 year 2000 with a C12. Please
Wayne A McCormick (Tuesday, 30 May 2023 23:56)
I'm looking for 2000 Freightliner xc air brake wiring diagram for pressure gauges and low air light.
Loney Ndlovu (Sunday, 21 May 2023 23:09)
Nice staff .please give me some more.l just got a part time job on frightliner argos trucks. I wish to learn more on electrical for the truck.
G (Thursday, 06 April 2023 02:38)
Hii looking for back up light diagram fl80 2000 model automatic transmission
ANTHONY (Wednesday, 22 March 2023 12:17)
2006 COLUMBIA FREIGHTLINER. No signal leaving the tractor to the trailer for the ABS. Need help
Mike (Friday, 17 March 2023 16:01)
Good morning, I was checking to see if you might have a copy of the wiring diagram/ schematic for the (hood mounted turn signals) on a 2019 freightliner 122sd? The signals in the headlight housings are in fact on a separate circuit from the front and rear sides. Thank you very much for your time.
Alin (Wednesday, 08 February 2023 05:01)
Guys, I've trouble with the turning left lights on the truck (Cascadia 2013) I've power on the fuse F4, but not in the pin... did someone have the same problem? How do you fix it... (I already changed the module and the new one get the same problem)
Justin (Thursday, 12 January 2023 00:04)
Looking for ignition schematic and ABS schematic for 2005 freightliner columbia VIN U74946 with c13 engine.
Darlings Boatworks (Tuesday, 27 December 2022 14:29)
Where can I download a wiring diagram for a 2007 M2 business class.
abe (Saturday, 17 December 2022 02:29)
Hi i need a tail light wiring diagram for a 2016 freightliner m2 106 hydraulic brake
Troy (Wednesday, 09 November 2022 06:10)
Could I please get the wiring diagram for a 1/1995 fL112
Scott Ballard (Sunday, 06 November 2022 16:18)
I’m after wiring diagram for bunk hvac on a 2016 freightliner Coronado
Mihkel (Tuesday, 04 October 2022 23:45)
I'm after wiring diagram for a 2005 argosy
Ashley (Saturday, 24 September 2022 20:51)
Need a wiring diagram for a 2005 century freightliner
Martha (Thursday, 02 June 2022 00:00)
I need the wiring diagram on a 2006 Freightliner FLD 120
Randall (Friday, 27 May 2022 18:34)
Need wiring diagram for the hood to fire wall on a 2001 fl80
Dillard Kersey (Sunday, 14 November 2021 21:05)
i need the wiring diagram