BOLT 0S1586 - Caterpillar

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Do not turn off the battery disconnect switch until the indicator lamp has turned off. If the switch is turned off when the indicator lamp is illuminated the Diesel Exhaust Fluid (DEF) system will not purge the DEF. If the DEF does not purge, DEF could freeze and damage the pump and lines.
Never move the battery disconnect switch to the OFF position while the engine is operating. Serious damage to the electrical system could result.
The battery disconnect switch is located on the left side of the machine.
Disconnect Switch OFF (1) - To deactivate the electrical system, turn the battery disconnect switch key counterclockwise to the OFF position.
Disconnect Switch ON (2) - To activate the electrical system, insert the battery disconnect switch key and turn the key clockwise. The key for the battery disconnect switch must be turned to the ON position before you start the engine.The battery disconnect switch and the engine start switch perform different functions. The entire electrical system is disabled when you turn the battery disconnect switch to the OFF position. The battery remains connected to the electrical system when you turn the engine start switch to the OFF position.Turn the battery disconnect switch to the OFF position and remove the key when you service the electrical system or any other machine components.
Never move the battery disconnect switch to the OFF position while the engine is operating. Serious damage to the electrical system could result.
To ensure that no damage to the engine occurs, verify that the engine is fully operational before cranking the engine. Do not crank an engine that is not fully operational.Perform the following procedure in order to check the battery disconnect switch for proper operation:
With the battery disconnect switch in the ON position, verify that electrical components in the operator compartment are functioning. Verify that the hour meter is displaying information. Verify that the engine will crank.
Turn the battery disconnect switch to the OFF position.
Verify that the following items are not functioning: electrical components in the operator compartment, hour meter and engine cranking. If any of the items continue to function with the battery disconnect switch in the OFF position, consult your Caterpillar dealer.