Cab Load Disconnect Switch
Warning: Turning the cab load disconnect switch (CLDS) to the off position does not disconnect the connection 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 connection between the battery and the most of the vehicle electrical system.
The CLDS may be mounted:
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inside the cab on the outboard side of the driver's seat;
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at the battery box;
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outboard on the left frame rail.
See Fig. for an EPA07 CLDS; see Fig. for an EPA10 and newer switch.
Fig. 1, Cab Load Disconnect Switch, EPA07
Fig. 2, Cab Load Disconnect Switch, EPA10 and Newer
If the CLDS is turned to the off position while the vehicle is running, the emergency power system will activate. The powertrain PDM will receive power from the emergency power feed, but the batteries will not be charging. See the Emergency Power Supply heading below for details.