Load Disconnect Switch
Turning the load disconnect switch 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.
The optional load disconnect switch (see Fig.) is used to avoid excessive draw on the battery when the vehicle is parked for an extended period of time.
When the load disconnect switch is set to OFF, it signals the PNDB to disconnect battery power to powertrain and accessory loads.
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;
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on/near the battery box;
Important: The ignition should be turned OFF before using the load disconnect switch.