Auxiliary Switches - RAM Chassis Cab 3500 2017 Quick Reference Manual

• Another factor is that outside temperature can
affect DEF consumption. In cold conditions,
12° F (-11° C) and below, the DEF gauge
needle can stay on a fixed position and may
not move for extended periods of time. This is
a normal function of the system.
• Since DEF will begin to freeze at 12°F
(-11°C), your vehicle is equipped with an
automatic DEF heating system. This allows
the DEF injection system to operate properly
at temperatures below 12°F (-11°C). If your
vehicle is not in operation for an extended
period of time with temperatures below 12°F
(-11°C), the DEF in the tank may freeze. If
the tank is overfilled and freezes, it could be
damaged. Therefore, do not overfill the DEF
tank. Extra care should be taken when filling
with portable containers to avoid overfilling.
Note the level of the DEF gauge in your
instrument cluster. On pickup applications,
you may safely add a maximum of 2 gallons
(7.5 liters) of DEF from portable containers
when your DEF gauge is reading ½ full. On
Chassis Cab applications, a maximum of
2 gallons (7.5 liters) may be added when the
DEF gauge is reading ¾ full.
• There is an electric heater inside the DEF
tank that automatically works when neces-
sary. And if the DEF supply does freeze, the
truck will operate normally until it thaws.
• Ensure the DEF cap is reinstalled prior to
filling vehicle with diesel fuel to avoid spill-
ing diesel fuel into the DEF Filler.

AUXILIARY SWITCHES

There can be up to five auxiliary switches located
in the lower switch bank of the instrument panel,
which can all be used to power various electronic
devices and PTO (Power Take Off) – if equipped.
Connections to the switches are found under the
hood in the connectors attached to the auxiliary
Power Distribution Center.
The system has the ability to configure the
functionality of the auxiliary switches via the
Instrument Cluster Display. All switches can
now be configured for ignition or battery power,
saving or not saving the state across a key cycle,
and momentary or latching switch operation.
For further information on using the auxiliary
switches, please refer to the Ram Body Builders
Guide by accessing www.rambodybuilder.com
and choosing the appropriate links.
For general questions on upfitting commercial
vehicles, including:
• Loose rear park assist installation
• Programmable auxiliary switches
• PTO (Power Take Off) system
• Wiring diagrams
• Vehicle dimensions
• Snow plow installation
• Weight charts and trailer towing
Please consult the Body Builders Guide at
www.rambodybuilder.com.
For further information, and applicable warnings
and cautions, please refer to your Owner's Manual
at www.ramtrucks.com/en/owners/manuals.