Electrical System

The circuit breaker/relay panel is located in the dash in front of the passenger seat. To access the compartment, press the button labeled PRESS and lift the top dash panel. See Fig. 3.1 .

The low voltage disconnect (LVD) feature protects the batteries from excessive discharge by disconnecting 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.

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 connection between the battery and the most of the vehicle electrical system. See Fig. 3.2 .

The CLDS may be mounted:

The batteries are typically located aft wall of the cab/sleeper compartment. To remove the cover from the battery box, release the latch and lift the cover.