If you have verified that the trailer wiring is fine, the short is gone, and you still have no power to the 7-way plug after performing a key cycle, the or required a computer reset via Daimler software (DiagnosticLink). If you’d like, I can: Tell you which pin on the 7-way plug controls each light.
The 7-way trailer plug on the back of the Cascadia is exposed to road salt, rain, and dirt. Open the plastic spring door on the trailer cord receptacle. Look for green crusties (copper oxide). Corrosion causes a short that will blow your or F31/F32 (Turn signals) instantly. 2019 freightliner cascadia trailer light fuse location
Finding the 2019 Freightliner Cascadia Trailer Light Fuse Location If you have verified that the trailer wiring
Always replace a blown fuse with one of the exact same amperage rating . Never replace a 15A fuse with a 20A or 30A fuse, as this can melt your wiring harness or cause an electrical fire. Common Reasons Trailer Fuses Keep Blowing Open the plastic spring door on the trailer cord receptacle
Unplug the 7-way cord from the back of the cab. Replace the fuse. Turn the truck lights on. If the fuse does not blow, the truck wiring is fine; the short circuit is located inside the 7-way cord or on the trailer itself.
If your trailer brakes are not illuminating when you press the pedal: