SAM Cab Fault
If the emergency power supply system activates, do
not shut down the engine until the vehicle is in a safe
position to do so. It will not be able to be restarted
until the problem is corrected. If emergency power
mode is due to a SAM Cab fault, the gauges will be-
come unresponsive but the engine will remain run-
ning until it is turned off.
When the ignition is in the ON position, the emer-
gency power supply will cause the following lamps to
flash:
•
dash panel lights
•
clearance lights
•
front marker lights
•
side marker lights
•
trailer taillights
•
rear stop lights
SAM Chassis Fault
The engine may be able to be restarted when the
SAM Chassis fails. When the ignition is in the ON
position, the emergency power supply will cause the
following lamps to flash:
•
dash panel lights
•
identification lights
•
front marker lights
•
turn-signal indicators in the ICU (alternately)
•
side marker lights
•
rear turn-signal lights
•
trailer taillights
If the ignition switch is turned ON while the load dis-
connect switch is in the OFF position, the emergency
power supply feature will activate the following
lamps:
•
clearance lights (flashing)
•
side marker lamps (flashing)
•
low beam headlights
Progressive Low Voltage
Disconnect
The progressive low voltage disconnect (PLVD) fea-
ture protects the batteries from excessive discharge
by disconnecting certain circuits from battery power
supply. This allows the batteries to maintain accept-
able charge to restart the vehicle.
When battery voltage drops below a predetermined
value, loads designated as comfort loads (priority
f544945
02/07/2007
Fig. 3.4, SAM Cab Location
Electrical System
3.4
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