Load Disconnect Switch
Warning: Turning the load disconnect switch to the OFF position doesnot disconnect the connection between the battery and the starter. To work on the vehicle safely, the negative leads must be disconnected from the battery.
The load disconnect switch is used to avoid excessive draw on the battery when the vehicle is parked for an extended period of time. See Fig.. When the load disconnect switch is set to OFF, it signals the PNDB to disconnect battery power to powertrain and accessory loads. The power to the aftertreatment-system control module is disconnected after the DEF purge function is completed.
Fig. 1, Load Disconnect Switch
The load disconnect switch is mounted in one of two locations:
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inside the cab on the left side of the driver's seat (left-hand-drive vehicle);
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on the battery box
Important: The ignition should be turned OFF before turning the load disconnect switch to ON or OFF.