intended to maintain vehicle speed while
Full Exhaust Brake is intended to reduce
vehicle speed.
• Automatic Exhaust Brake can be enabled
by pushing the exhaust brake button again
any time after the normal Full Exhaust
Brake has been turned on. The “Exhaust
Brake Indicator” in the instrument cluster
will change from yellow to green when
Automatic Exhaust Brake is enabled.
Pushing the exhaust brake button again
will toggle the exhaust brake mode to off.
2500/3500 AIR SUSPENSION
SYSTEM
This air suspension system is a rear leveling
ride height system. The main purpose of this
system is to maintain the truck’s rear ride
height level. There are two selectable heights
that can be chosen based on your operating
conditions.
The system requires that the ignition be in
ON/RUN or the engine running with zero
vehicle speed for all user requested changes
and load leveling.
Alternate Trailer Height Button
Normal Ride Height (NRH)
– This is the stan
-
dard position of the suspension and is meant
for normal driving. It will automatically
adjust to maintain the rear ride height as
conditions change.
Alternate Trailer Height (ATH)
– Lowers the
vehicle approximately 1 inch (25 mm) for a
level truck, to be used as required while
trailer towing. It will automatically adjust to
maintain the rear ride height as conditions
change.
NOTE:
Most 3500 models will not lower to Alternate
Trailer Height (ATH) when unloaded.
Trailer Decoupling/Unloading
- The air
suspension system will continue to load level
after the vehicle has been turned off for
10 minutes without compressor activation.
This allows for easy removal of a trailer and/
or load from the back of the truck by main
-
taining the ride height. After 10 minutes you
will need to turn the ignition to the RUN
position for the air suspension to re-level due
to addition/removal of load in the vehicle. If
the air suspension system is disabled using
the settings menu (Tire Jack Mode, Trans
-
port Mode, Alignment Mode, or Bed
Lowering Mode) the system will remain
disabled when the vehicle is turned off.
Reactivating the air suspension can be
accomplished via the settings menu or
driving the vehicle above 5 mph (8 km/h) for
Tire Jack Mode or Alignment Mode and
16 mph (26 km/h) for Transport Mode and
Bed Lowering Mode.
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.
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