NHTSA ID Number: 10179873
Manufacturer Communication Number: SB54-335
TSB/Document Date: 2020-09-16
Summary
Freightliner
Service Bulletin for Optional 30K High-Current Trailer Cord Circuit Breaker Replacement. New Cascadia vehicles manufactured from September 1, 2016 through June 28, 2020 with an optional high current single- or dual-pole trailer cord were equipped with an auto-reset type I circuit breaker mounted in the battery cable access (BCA) box. Since type I circuit breakers can mask potential issues by resetting every time an over-current condition occurs, Daimler Trucks North America (DTNA) switched to a manual reset type III circuit breaker on June 29, 2020. This bulletin includes instructions for converting from a type I to a type III circuit breaker, how and where to reset a type III circuit breaker, and conditions to be aware of when troubleshooting a type III circuit breaker.
Optional 30K High-Current Trailer Cord Circuit Breaker
Replacement
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
54-335
Freightliner
Service Bulletin
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
General Information
New Cascadia vehicles manufactured from September 1, 2016 through June 28, 2020 with an optional highcurrent single- or dual-pole trailer cord were equipped with an auto-reset type I circuit breaker mounted in the
battery cable access (BCA) box. Since type I circuit breakers can mask potential issues by resetting every time
an over-current condition occurs, Daimler Trucks North America (DTNA) switched to a manual reset type III
circuit breaker on June 29, 2020.
This bulletin includes instructions for converting from a type I to a type III circuit breaker, how and where to
reset a type III circuit breaker, and conditions to be aware of when troubleshooting a type III circuit breaker.
Parts
Parts Table*
Replacement Part
Number
MPM ANRST090
MPM ANRST150
Part Description
Type III 90A Manual Reset Circuit Breaker
Type III 150A Manual Reset Circuit Breaker
Quantity
1
1
Original Circuit Breaker
Type 1 Auto Reset 90 Amp
Type 1 Auto Reset 150 Amp
* Only one circuit breaker is required per vehicle, either a 90 amp or a 150 amp.
Table 1, Parts Table
Work Instructions
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Disconnect the batteries.
3. Open the hood.
4. Remove the battery cable access (BCA) box cover. The BCA box is located on the right side of the cab
front wall.
5. Locate the type I high-current circuit breaker in the BCA box. See Fig. 1 and Fig. 2.
Freightliner Service Bulletin, 09/03/2020
Page 1
54-335
Freightliner
Service Bulletin
Optional 30K High-Current Trailer Cord Circuit Breaker
Replacement
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
1
06/24/2020
f547286
Fig. 1, High-Current Circuit Breaker in the BCA Box
07/29/2020
f547304
1. High-Current Circuit Breaker
Fig. 2, Location of High-Current Circuit Breaker
6. Remove the two mounting nuts and remove the type I circuit breaker.
7. Install the new type III circuit breaker in the BCA.
8. Install and tighten the two mounting nuts to a maximum of 49 lbs·in (556 N·cm)
Manually Resetting the Type III Circuit Breaker
The type III manual reset circuit breaker comes with a label noting where the reset hole is located and how to
reset the breaker using a blunt tool. See Fig. 3.
07/29/2020
f547303
Fig. 3, Circuit Breaker With Label
Page 2
Freightliner Service Bulletin, 09/03/2020
Optional 30K High-Current Trailer Cord Circuit Breaker
Replacement
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy
Cargo
Columbia
122SD and Coronado
54-335
Freightliner
Service Bulletin
Business Class M2
Cascadia
108SD/114SD
> New Cascadia
Troubleshooting a Type III Circuit Breaker
Due to current space constraints within the BCA, the type III circuit breaker does not have a visual indicator
showing when the circuit breaker is open and needs to be reset.
In addition, the most common use of the high-current trailer cord is for trailer battery charging. This use can
make it difficult to determine when or if the type III circuit breaker needs to be reset; when the cord is
connected, trailer battery voltage can be present on one side and vehicle voltage can be present on the other.
See Fig. 4.
4
1
2
3
08/21/2020
1. Trailer Batteries
2. Trailer Cord
f547305
3. Vehicle Batteries
4. Circuit Breaker
Fig. 4, High-Current Trailer Cord Used for Trailer
Battery Charging
Unplug the high-current trailer cord from the trailer before checking to see if the type III circuit breaker is in an
open or closed state.
With the trailer cord disconnected and vehicle voltage supplied to the circuit breaker, both studs on the circuit
breaker should show voltage when the circuit is closed and not in need of a reset.
With the trailer cord disconnected and vehicle voltage supplied to the circuit breaker, if only one stud on the
circuit breaker shows voltage, then the breaker has failed or needs to be manually reset.
Warranty
This is an informational bulletin only. Warranty does not apply.
Freightliner Service Bulletin, 09/03/2020
Page 3
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TSB/Document ID: SB54-335
Replacement Service Bulletin Number:
MFR Communication Date: 2020-09-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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