Purpose
The L
VD may increase battery life and
prevent unnecessary jump start conditions
by ensuring that an unattended load does
not deplete the battery charge to a level
that will prevent you from starting your
vehicle.
Operation
The LVD will disconnect non-vital battery
loads when battery voltage drops below
12.3V for 3 minutes and the key switch is
in the ACC or OFF position. During the last
2 minutes the LVD will emit a slow audible
beep. 30 seconds before disconnecting
loads the alarm will change to a fast beep.
The battery voltage must come back up
above a certain voltage before the LVD will
reset.
See an authorized dealer if the LVD fails to
reconnect loads during normal operation.
Circuits Disconnected by LVD
• Cab Dome Lamps
• Cab Accessories
• Spare Battery A & B
NOTE
All LVD circuits are color-coded blue
on
the central electrical panel cover la-
bel.
WARNING
DO NOT use the Spare Battery A and
B
circuits or other circuits that are con-
trolled by the LVD to power electronic
engine controls, ABS circuits, or safe-
ty/work related lighting. Before adding
any device to the vehicle's electrical
system, consult your nearest author-
ized dealer or read the contents of
TMC RP136. Failure to do so may
cause equipment damage or lead to
personal injury.
NOTE
The determination of what circuits/
loads
that were connected to the LVD
was based upon the recommendation
from Technology and Maintenance
Council (TMC) of the American Truck-
ing
Association. To review the recom-
mended practice, see TMC RP-136.
Brakes, ABS Off-Road
Turn switch on to engage ABS Off-Road
mode. See Anti-Lock Brake System (ABS)
on page
55.
Brakes, Parking Brake Valve
Pull yellow knob to activate parking brakes.
Brake, T
railer Hand
This dash mounted switch provides air
pressure to apply the trailer brakes only
. It
operates independently of the foot treadle
valve.
CONTROLS - Dash Switches
88 Y53-6113-1A1 (11/20)
3
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