Typically F6 or F21 (depending on standard or optional fleet configurations). Amperage: 20 Amp or 15 Amp.
Note: In 2019 models, these are often high-amperage breakers (20A-30A) rather than standard spade fuses. Steps to Troubleshooting Trailer Lights 2019 freightliner cascadia trailer light fuse location
Look closely at the fuse grid map printed on the underside of the dashboard cover panel. Locate the following fuses: Fuse Number Amperage Rating Function / Circuit Covered Trailer Tow Power Receptacle (Main Power) F2 Trailer Tail Lights (Marker / Clearance) F3 Trailer Left Turn Signal / Brake Light F4 Trailer Right Turn Signal / Brake Light F5 Trailer ABS Power F16 Trailer Auxiliary / Utility Light Power 2. Mega-Fuses (Under-Hood PNDB) Typically F6 or F21 (depending on standard or