Before swapping fuses, visually check the green 7-way electrical cord between the tractor and trailer. Look for cuts, abrasions, or green corrosion inside the plug. A short circuit in a damaged cord will instantly blow your brand-new fuse the second you plug it back in. 3. Pull and Test the Fuse
The trailer lighting fuses for a 2019 Cascadia are located in the . This is the large black box located on the driver’s side firewall inside the engine bay. 2019 freightliner cascadia trailer light fuse location