PULLEY 5S7609 - Caterpillar

Reference
Refer to the Schematic and the Troubleshooting, "Electronic Troubleshooting" for additional information on your engine.Grounding Practices
Proper grounding for the electrical system is necessary for proper engine performance and reliability. Improper grounding will result in unreliable electrical circuit paths and in uncontrolled electrical circuit paths.Uncontrolled engine electrical circuit paths can result in damage to the main bearings, to the crankshaft bearing journal surfaces, and to the aluminum components.Uncontrolled electrical circuit paths can cause electrical noise which may degrade performance.In order to ensure proper functioning of the electrical system, an engine-to-frame ground strap with a direct path to the battery must be used. This may be provided by a ground for the starting motor, by a frame to the ground for the starting motor, or by a direct frame to engine ground. An engine-to-frame ground strap must be run from the grounding stud of the engine to the frame and to the negative battery post.Connect the battery negative post to the frame rail. From the frame rail, connect the ground wire to one of the following locations:
Cylinder head ground stud
Optional engine ground stud connectionThe engine must be grounded to the frame rail. Connect the battery negative post to one of the following locations:
Cylinder head ground stud
Optional engine ground stud connectionThe engine must have a ground wire to the battery.Ground wires or ground straps should be combined at the studs that are only for ground use.All of the ground paths must be capable of carrying any potential currents. The engine alternator should be grounded to the battery with a wire size that is capable of managing the full charging current of the alternator.
When jump starting an engine, the instructions in the Operation and Maintenance Manual, "Starting with Jump Start Cables" should be followed in order to properly start the engine.This engine may be equipped with a 12 volt starting system or with a 24 volt starting system. Only equal voltage for boost starting should be used. The use of a welder or of a higher voltage will damage the electrical system.
The engine has several input components which are electronic. These components require an operating voltage.This engine is tolerant to common external sources of electrical noise. Electromechanical buzzers can cause disruptions in the power supply. If electromechanical buzzers are used near the system, the engine electronics should be powered directly from the battery system through a dedicated relay. The engine electronics should not be powered through a common power bus with other devices that are activated by the Engine Control Switch (ECS).Engine Electrical System
The electrical system can have three separate circuits. The three circuits are the charging circuit, the starting circuit, and the low amperage circuit. Some of the electrical system components are used in more than one circuit.The charging circuit is in operation when the engine is running. An alternator creates electricity for the charging circuit. A voltage regulator in the circuit controls the electrical output in order to maintain the battery at full charge.The starting circuit is in operation when