Voltage and Fuel Efficiency
Controls
Cab Load Disconnect Switch
WARNING
Turning the cab load disconnect switch (CLDS) to
the off position does not disconnect the connec-
tion between the battery and the starter. To work
on the vehicle safely, the negative leads must be
disconnected from the battery.
IMPORTANT: The ignition should be turned off
before turning the CLDS to on or off.
The CLDS is used to avoid excessive draw on the
battery when the vehicle is parked for an extended
period of time by disconnecting (or opening) the con-
nection between the battery and the most of the ve-
hicle electrical system. See Fig. 2.33.
The CLDS may be mounted:
•
inside the cab on the outboard side of the driv-
er’s seat;
•
at the battery box;
•
outboard on the left frame rail.
Idle Shutdown Timer
This feature is an optional 1-to-100 minute idle shut-
down system. Its purpose is to conserve fuel by
eliminating excessive idling, and allowing a turbo-
charger cool-down period. To activate the shutdown,
the transmission must be in neutral with the vehicle
parking brakes set and the engine in idle or fast-idle
mode.
Low Voltage Disconnect Feature
The low voltage disconnect (LVD) feature protects
the batteries from excessive discharge by discon-
necting certain circuits from battery power supply.
This allows the batteries to maintain acceptable
charge to restart the vehicle. The LVD system turns
off cab and sleeper accessories when voltage drops
to 12.3 volts. An alarm sounds for one minute before
accessories are turned off. If no action is taken within
that minute, the LVD module will shut off power to
predetermined cab and sleeper circuits and illuminate
an LED indicator on the LVD module located inside
the right-hand door frame behind the seat. These
circuits will remain off until the LVD measures 13.0
volts on the electrical system, which can be done by
starting the engine. After the engine is started, the
system will reset.
All vehicles equipped with LVD should have a sticker
on the dash indicating the presence of the system.
Another sticker is located inside the right-hand door
frame behind the seat, along with the LVD module.
Optimized Idle
®
Optimized Idle reduces engine idle time by running
the engine only when required. Optimized Idle auto-
matically shuts down and restarts the engine as
needed to ensure engine oil temperature remains
within factory preset limits, the batteries stay
charged, and cab/sleeper temperature remains at the
thermostat setting. The benefits of the system in-
clude reduced engine idle time, fuel savings, reduc-
tion of exhaust emissions and noise, increased
starter and engine life, and reduced chance of dead
batteries.
07/25/2008
TRIP ADVISORIES
23 ROLL 518 BRK
f040771
A
A. RSA Lev. 1 has more than 9 counts.
Fig. 2.32, Trip Advisor Message Screen (more than 9
counts)
06/19/2007 f545071
Fig. 2.33, Cab Load Disconnect Switch
Instruments and Controls Identification
2.28
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