NHTSA ID Number: 10189096
Manufacturer Communication Number: ICI17-019
TSB/Document Date: 2021-03-15
Summary
ICI17-019 TBB Maintenance Guidelines for Electrical Power Distribution Centers
ATTENTION: Dealer Principal, Warranty Manager, Service
Manager, Parts Manager
Thomas Built Bus Dealers – U.S. and Canada
Export Distributors
Direct Warranty Customers U.S. and Canada
REF #:
ICI17-019
Effective:
08/03/2017
Release:
08/09/2017
Daimler Trucks North America LLC
WARRANTY CAMPAIGNS DEPARTMENT
P.O. Box 4090
800-547-0712
Portland, Oregon 97208-4090
FAX 503-745-9009
If you have questions
about this Letter, please
submit your inquiry on the
Web using the WSC Link
on DTNAConnect
SUBJECT: TBB Maintenance Guidelines for Electrical Power Distribution Centers
This letter is to inform you of a mailing to Thomas Built Buses customers emphasizing the proper care and
maintenance of electrical systems on buses. The mailing started approximately 8/3/17.
A copy follows for your reference.
This notice is for your information only. There is no specific action for customers or Thomas
dealers to take.
If you have questions or need further information, contact the Warranty Campaigns Department by
submitting an inquiry through www.AccessFreightliner.com / Support / My Tickets and Submit an Inquiry
from 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday.
The information contained in this letter supercedes and supplements any related policies and procedures in any previously
released bulletins, the Warranty Manual, and/or previously released letters. Failure to read or distribute this letter will not
exempt addressees from compliance with the information contained herein.
Page 1 of 1
Thomas Built Buses LLC
May 17, 2017
Subject: Electrical Cabinet Maintenance Practices
Thomas Built Bus (TBB) would like to emphasize some important information regarding maintenance practices
around the electrical cabinet installed on MVP-ER, ER/HD, HDX & FS-65 model vehicles.
Please review the enclosed maintenance guidelines addressing the need for inspection and maintaining the
electrical cabinet.
We hope you find this maintenance guideline helpful.
WARRANTY CAMPAIGNS DEPARTMENT
Enclosure
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
Subject: Maintenance Guidelines for Electrical Power Distribution Center
(PC Board Configuration)
Models Affected:
MVP-ER, HDX, ER, MVP-EF, FS65
General Information
Thomas Built Buses emphasizes proper care and maintenance of all electrical systems. Inspect and
maintain printed circuit boards and other electrical components located in the front left exterior electrical
side panel on a bi-annual frequency.
Failure to follow the guidelines may increase the potential of Electrical Power Distribution Center failure.
Printed circuit boards and other electrical components exposed to water should be thoroughly inspected
for corrosion and water intrusion. If boards or components show signs of continued water exposure or
corrosion, the leak source must be stopped and the boards and other affected components replaced
immediately.
Do not power wash or steam clean the door of Electrical Power Distribution
Center. Power washing/ steam cleaning near the Electrical Power
Distribution Center may permanently damage components which could
result in fire, personal injury, or property damage. The driver’s window must
remain closed at any time there is water exposure. Do not place any liquid
container above, on, or inside switch cabinet.
Figure 1: Overview example of exterior electrical cabinet door and driver’s window
Page 1
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
General Practices
1. Do not expose PC boards or other electrical components to water or moisture. Take the
following actions to prevent water exposure:
a) Check the exterior panel door and gasket for proper closure and sealing. The gasket
should be evenly installed around the door perimeter and the door should align with
the panel opening. Check for broken door gasket. The door should close and latch
fully. Adjust latch and pull to ensure a tight closure. Do not loosen latch to enable ease
of access.
Figure 2: Acceptable - Door is parallel with panel opening.
Latch draws gasket tight against body panel.
Figure 3: Unacceptable - Door is bent and does not close fully.
Page 2
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
b) Ensure Product Service Bulletin B Index 5 #19, Protective Cover for PC Boards,
has been completed on your vehicle. Note: OEM supplied covers may be white or
black
Figure 4: Acceptable - Proper installation of covers
c) Ensure PC board covers do not have cracks or other damage.
Figure 5: Unacceptable - Cracked PC board cover may result in water intrusion
Page 3
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
d) Inspect the electrical door seal, PC boards and other electrical components to ensure
they are dry and in full working condition.
e) Inspect driver’s window. Make sure that felt seal is sealing properly. Clean drain
troughs, to ensure adequate drainage. Reapply new caulk if cracked or degraded.
Figure 6 and 7: Unacceptable - Cracked and dry old caulk and drain holes needing repairing
Page 4
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
f) Inspect PC boards and internal components at the inspection interval for signs of water
exposure. Water draining from the bottom of the electrical panel door after a rain or
bus wash may indicate water intrusion. Water intrusion into the electrical cabinet can
cause corrosion on the electrical devices. All electrical devices showing signs of
corrosion must be replaced.
Visible corrosion
Visible corrosion
Page 5
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
Figure: 8, 9 and 10: Unacceptable - Examples of corrosion that need to be addressed with new
components.
g) When a power distribution board is replaced the addition of DTNA recommended
dielectric grease must be added to the wire hardness sockets, relay sockets, and fuse
slots. Reference DTNA Engineering Standard 48-02439 for approved dielectric
greases.
h) The ring terminal electrical cables connected to the power distribution board power
studs must be secured with nylon locknuts torqued to 65in-lbs (+/- 2in-lbs).
Figure: 11: Acceptable – OEM power studs.
Page 6
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
2. The fuses or manual circuit breakers rating, installed into the power distribution boards,
must match the rating specified by the supplied label located on the external side
electrical cabinet door or service manual.
Fuse and manual breaker ratings MUST NOT exceed the specified design rating.
Do not replace any fuse or manual reset breaker with an auto reset
breaker of any type. The use of auto reset breakers can permanently
damage components which could result in fire, personal injury, or
property damage.
Figure: 12: Acceptable - Example of Fusing labeling on inside of Electrical Panel Door.
Page 7
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
Figure 13: Acceptable - Example
of Standard
Fuse
Figure 14: Acceptable - Examples of Manual Reset
Breakers
Figure 15: Unacceptable - Examples of Auto Reset Breakers
Page 8
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
Vehicle Owner Information
1. Ensure all applicable recalls have been completed for your vehicle. Perform all applicable
Vehicle Owner Notifications (VON’s), Field Service Campaigns (FSC’s), Safety
Awareness Bulletins (SAB’s), and Product Service Bulletins (PSB’s) that affect the
vehicle. See www.thomasbusonline.com for details or call your local dealer.
Non-OEM Electrical Add-On Devices
1. Do not obtain power, ignition, and ground from the electrical distribution board lug
terminals. Do not modify or source power from the electrical power distribution center for
any reason including aftermarket add-ons that include but are not limited to: CB radios,
Surveillance systems, Power inverters, and any other Non-OEM electrical devices.
Figure: 16: Unacceptable - An example of add-on connections attached to the power, ignition, and
ground studs.
Page 9
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
Figure: 17: Unacceptable - Add-on connections attached to the power, ignition, and ground studs.
Figure: 18: Acceptable - Example of proper OEM electrical connections without Add-on
connections.
Page 10
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
2. Do not splice into any vehicle harness wires to obtain electrical signals or power unless
instructed by Thomas Built Bus documentation. Methods include but not limited to: scotch
locks, stripping off of wire sheath, butt-splicing, etc.
Figure: 19: Example of a scotch lock and butt splice.
Figure: 20: Example of a wire sheath stripping and electrical tape.
Page 11
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
3. Do not plug wires or terminals into the electrical distribution board sockets or slots.
Figure: 21: Unacceptable - Add-on connections improperly sourcing power from fuse and relay
sockets.
Page 12
Maintenance Guidelines
Daimler Trucks
Octobv
North America LLC
Thomas Built Buses
Date: May 2017
This document supersedes any previously published Safety Awareness Bulletins, and Service
Solutions concerning the Electrical Distribution Center. All previous recall notices are in
conjunction with this document. If there are any questions or concerns please contact your local
Thomas Built Buses Dealer. A dealer locator is available on our website: www.thomasbus.com.
Page 13
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TSB/Document ID: ICI17-019
Replacement Service Bulletin Number:
MFR Communication Date: 2017-08-03
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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