54–01 Trailer Cable Inspection
and Cleaning
1. Disconnect the trailer electrical cables from the
sockets at the cab.
2. Inspect the cables and sockets for evidence of
corrosion, and clean as necessary. If a socket is
too badly corroded to clean, replace it.
Freightliner recommends also replacing the
socket’s harness as well, if the corrosion has
gotten into the wires and connectors inside the
socket.
IMPORTANT: If using a spray cleaner to remove
corrosion, be careful to protect any surrounding
painted surfaces.
3. Apply a thin coat of lithium-based dielectric
grease, such as Lubriplate FLP DS–ES, on the
inside of the sockets.
4. Connect the cables.
54–02 Electrical Component
Inspection
1. Park the vehicle on a level surface, apply the
parking brakes, and shut down the engine.
Chock the tires.
2. Disconnect the batteries.
3. Inspect the condition of the electrical component.
Check for signs of excess dirt/debris build up on
or around the component. If exterior cleaning is
needed for a thorough inspection, clean exterior
debris from the component using a dry method
such as a vacuum cleaner or using an electrical
contact cleaner such as CRC QD® Electronic
Cleaner.
4. Check all mounting points for loose, broken, or
missing parts. The component must be securely
mounted. All loose, broken, or missing parts
must be repaired to maintain proper component
function.
5. Inspect the component protective cover for
proper fit and function. Inspect the cover for
cracks, broken mounting, missing sealing
surfaces, warped or bulged surfaces. The cover
must prevent moisture and debris from entering
the components protected area. Missing, leaking,
or damaged covers will result in moisture and
debris entering the component and will result in
component failure. When it is determined that a
cover has not properly prevented moisture and
debris from entering the component, the entire
component must be replaced.
6. Inspect the component exterior for signs of
thermal distortion, warping, bulging, discoloration,
amperage related heating, color variance or
shading across the component which could be a
sign of internal failure requiring replacement of
the component. The root source causing
conditions of high heat, excess amperage, and/or
circuit overload component failures must be
diagnosed and repaired prior to replacing the
component.
7. Inspect component housing sub-assembly clips
and fasteners for correct fit and location and that
component sub-assembly housing seams are
tight and secure. Missing, leaking, or damaged
component housings must be replaced.
8. Check main power cable connections for a clean
and secure fit. Connections should be free of
corrosion, dirt and moisture. Connections should
not have signs of thermal distortion, warping,
discoloration, high amperage heating or
discoloring. If needed, disconnect the cables,
scrub and clean as needed using a nylon brush.
Clean debris with a vacuum or electrical contact
cleaner such as CRC QD® Electronic Cleaner,
inspect terminals and mating contact terminal
plating. If the terminal plating exhibits signs of
unrecoverable corrosion, replace the component
and terminal. Indications of unrecoverable
corrosion on terminal plating are:
• Heavy staining that cannot be cleaned off
with a nylon brush or contact cleaner;
• erosion and pitting on terminal plating
causing uneven surfaces; or
• discoloration caused by the outer layer of
plating being removed by corrosion or wear
exposing the under layer material of the
terminal.
9. Check all electrical connectors for correct fit and
that the connector locking tabs are in place and
will hold the connector firmly into the component.
Inspect connector terminals for signs of
corrosion, thermal distortion, warping,
discoloration, high amperage heating or
Electrical, Instruments, and Controls 54
Business Class M2 Plus Maintenance Manual, 02/10/2023 54/1
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