HOSE AS 1Q1497 - Caterpillar

If equipped with emissions aftertreatment, allow at least 2 minutes after shutting down the engine before you turn the battery disconnect switch to OFF. Disconnecting the battery power too soon will prevent purging of the DEF lines after the engine is shut down.
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 on the right side of the machine behind the engine compartment access door.
Illustration 1 g00406959
ON - Insert the key. Turn the key clockwise in order to activate the electrical system. The battery disconnect switch must be on before starting the engine.
OFF - Turn the key counterclockwise in order to shut off the electrical system.The battery disconnect switch serves a different function from the engine start switch. When the battery disconnect switch is turned off, the entire electrical system is disabled. When only the engine start switch is turned off, the battery remains connected to the electrical system.When you are servicing the electrical system or other components on the machine, turn the battery disconnect switch to OFF and remove the key. Before leaving the machine for the day, turn the battery disconnect switch key to OFF and remove the key. Removal of the key will prevent the drain of the battery by a short circuit, by a current draw, or by vandalism.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.