: There is two wirings for your motorhome; the Freightliner chassis wiring and then the FR cabin wiring. Things like the headlights, marker lights, taillights and dash are Freightliner.
Daimler, the parent of Freightliner has a website where you can look up every chassis part and schematics for the Freightliner chassis. The schematics are not wiring diagrams and are difficult to correlate to physical locations.
You need to join the website and once logged-in, you enter the last six digits of your VIN. It then will have everything related to your particular chassis.
Its website is:
They are transitioning to a new website soon, at:
I wish that FR has something like that for the cabin.