If you are looking for physical fuses and relays that assist the trailer power distribution, they are located in the . Location of the Main PDC Where: Inside the passenger-side dashboard. How to access: Go to the passenger side of the cab.
: Inspect the trailer pigtail cord for visible cuts.
Remove the retaining screws or unclip the plastic panel fasteners.
On some configurations, this module is located under the hood on the firewall or near the steering rod. The Glove Box: 2019 freightliner cascadia trailer light fuse location
: Located behind the glove box on the passenger side. Accessing this involves removing the glove box (typically requiring a T-25 Torx driver) and a protective rain guard.
Inspect the SAM Chassis module for moisture or corrosion.
Many of the "fuses" here are actually resettable breakers. If a short exists in the trailer pigtail, the SAM module will kill power to that circuit to prevent damage. 2. The SAM Cabin Module (Passenger Side Interior) Location: Under the dash on the passenger side. If you are looking for physical fuses and
When your trailer lights go dark, follow this logical progression to isolate the fault quickly: Step 1: Test the Tractor First
Safely pull over and turn off the truck's ignition completely.
If replacing a blown fuse solves the problem, your work is done. If the new fuse blows immediately, or if the fuse is fine but the lights still don't work, follow this systematic diagnostic path. : Inspect the trailer pigtail cord for visible cuts
When looking at the diagram under the SAM Chassis cover, identify the following fuses or relays associated with the 7-way trailer plug:
Use a dedicated plastic fuse puller tool to extract the targeted fuse (e.g., F2 for tail lights).
Once the short is fixed, turn the truck ignition off for at least 60 seconds. Then, turn it back on. The SAM module will re-test the circuit, and if the short is gone, the lights will come back on.
+---------------------------------------+ | Fuse Box | +---------------------------------------+ | Fuse | Fuse Name | Rating | | Number | | | +---------------------------------------+ | 13 | Trailer | 20A | | | Lights (TL) | | +---------------------------------------+ | 14 | Trailer | 20A | | | Lights (TL) | | +---------------------------------------+
On a 2019 model, traditional fuses (like #20 for older Cascadia trailer lights) are often replaced by .
If you are looking for physical fuses and relays that assist the trailer power distribution, they are located in the . Location of the Main PDC Where: Inside the passenger-side dashboard. How to access: Go to the passenger side of the cab.
: Inspect the trailer pigtail cord for visible cuts.
Remove the retaining screws or unclip the plastic panel fasteners.
On some configurations, this module is located under the hood on the firewall or near the steering rod. The Glove Box:
: Located behind the glove box on the passenger side. Accessing this involves removing the glove box (typically requiring a T-25 Torx driver) and a protective rain guard.
Inspect the SAM Chassis module for moisture or corrosion.
Many of the "fuses" here are actually resettable breakers. If a short exists in the trailer pigtail, the SAM module will kill power to that circuit to prevent damage. 2. The SAM Cabin Module (Passenger Side Interior) Location: Under the dash on the passenger side.
When your trailer lights go dark, follow this logical progression to isolate the fault quickly: Step 1: Test the Tractor First
Safely pull over and turn off the truck's ignition completely.
If replacing a blown fuse solves the problem, your work is done. If the new fuse blows immediately, or if the fuse is fine but the lights still don't work, follow this systematic diagnostic path.
When looking at the diagram under the SAM Chassis cover, identify the following fuses or relays associated with the 7-way trailer plug:
Use a dedicated plastic fuse puller tool to extract the targeted fuse (e.g., F2 for tail lights).
Once the short is fixed, turn the truck ignition off for at least 60 seconds. Then, turn it back on. The SAM module will re-test the circuit, and if the short is gone, the lights will come back on.
+---------------------------------------+ | Fuse Box | +---------------------------------------+ | Fuse | Fuse Name | Rating | | Number | | | +---------------------------------------+ | 13 | Trailer | 20A | | | Lights (TL) | | +---------------------------------------+ | 14 | Trailer | 20A | | | Lights (TL) | | +---------------------------------------+
On a 2019 model, traditional fuses (like #20 for older Cascadia trailer lights) are often replaced by .
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