For a 2019 Freightliner Cascadia (Gen 2/New Cascadia), the trailer light control system has shifted from traditional dedicated fuses on the firewall to an integrated electronic control system. Primary Fuse and Module Locations
Have a different year Cascadia? The 2016-2018 models use a similar layout, but 2020+ models moved some circuits to the bunk fuse panel. 2019 freightliner cascadia trailer light fuse location
However, finding that specific fuse in a Cascadia can feel like searching for a needle in a haystack if you don’t know the layout. Unlike older trucks, the 2019 model uses a mix of standard blade fuses and tricky HDM (High Density Modular) relays. For a 2019 Freightliner Cascadia (Gen 2/New Cascadia),
If the fuses/breakers are good, the issue is often corrosion inside the 7-way plug on the back of the truck. Clean the pins and check for a loose ground wire (usually the white wire inside the plug). Running Lights: Fuse ~20-25A (Yellow) — Check F25/F24
There are three main areas where you will find fuses and relays on a 2019 model:
