GEAR ASSEM. 8S3487 - Caterpillar

The battery disconnect switch is located near the engine starter.
Illustration 1 g03595376
ON - To activate the electrical system, turn the battery disconnect switch clockwise. The battery disconnect switch must be turned to the ON position before you start the engine.
OFF - To deactivate the electrical system, turn the battery disconnect switch counterclockwise to the OFF position.Note: The battery disconnect switch can be locked in the OFF position with a padlock.The battery disconnect switch and the engine start switch perform different functions. Turn off the battery disconnect switch in order to disable the entire electrical system. The battery remains connected to the electrical system when you turn off the engine start switch.Turn the battery disconnect switch to the OFF position when you service the electrical system or any other components, or to prevent drainage of the battery.
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. In the OFF position, the battery charger and ethernet switch module remain active and connected to the batteries. The overhead lights inside the power module are powered directly from the batteries with circuit breaker protection and a timer switch.