RAM Commercial CHASSIS CAB 3500 2021 Owner's Manual page 211

Type of Trailer Brakes Electric Trailer Brakes
Load *Under 10,000 lbs (4,536 kg) *Above 10,000 lbs (4,536 kg) *Under 10,000 lbs (4,536 kg) *Above 10,000 lbs (4,536 kg)
* The suggested selection depends and
may change depending on the customer
preferences for braking performance. Condition
of the trailer brakes, driving and road state may
also affect the selection.
Display Messages
The trailer brake control interacts with the
instrument cluster display. Display messages,
along with a single chime, will be displayed
when a malfunction is determined in the trailer
connection, trailer brake control, or on the
trailer Ú page 90.
WARNING!
Connecting a trailer that is not compatible with
the ITBM system may result in reduced or
complete loss of trailer braking. There may be a
increase in stopping distance or trailer instability
which could result in personal injury.
Light Electric Heavy Electric
Electric Trailer Brakes
CAUTION!
Connecting a trailer that is not compatible
with the ITBM system may result in reduced
or complete loss of trailer braking. There may
be a increase in stopping distance or trailer
instability which could result in damage to
your vehicle, trailer, or other property.
NOTE:
An aftermarket controller may be available

for use with trailers with air or EOH trailer
brake systems. To determine the type of
brakes on your trailer and the availability of
controllers, check with your trailer manufac-
turer or dealer.
Removal of the ITBM will cause errors and it

may cause damage to the electrical system
and electronic modules of the vehicle. See an
authorized dealer if an aftermarket module is
to be installed.
STARTING AND OPERATING
Light EOH
Electric over Hydraulic Electric over Hydraulic
Trailer Brakes Trailer Brakes
Towing Requirements — Trailer Lights And
Wiring
Whenever you pull a trailer, regardless of the
trailer size, stoplights and turn signals on the
trailer are required for motoring safety.
The Trailer Tow Package may include a four- and
seven-pin wiring harness. Use a factory
approved trailer harness and connector.
NOTE:
Do not cut or splice wiring into the vehicle's
wiring harness.
The electrical connections are all complete to
the vehicle but you must mate the harness
to a trailer connector. Refer to the following
illustrations.
209
Heavy EOH
4