WASHER 4432280 - Caterpillar

Grounding Practices
Ensure that the electrical system for the engine is properly grounded. Proper grounding is necessary for optimum engine performance and reliability. Improper grounding will result in uncontrolled electrical circuit paths and in unreliable electrical circuit paths.Uncontrolled electrical circuit paths can result in damage to main bearings, to crankshaft bearing journal surfaces, and to aluminum components. Uncontrolled electrical circuit paths can also cause electrical noise.The alternator, the starting motor, and all of the electrical systems MUST be grounded to the negative "−" battery terminal.For engines with an alternator that is grounded to an engine component, a ground strap MUST connect that component to the negative "−" battery terminal. The component MUST also be electrically isolated from the engine.A bus bar with a direct path to the negative "-" battery terminal is permissible and recommended for use for all components that require a negative "-" battery connection. Connect the bus bar directly to the negative "-" battery terminal. A bonding cable should also be connected from the cylinder block to the bus bar on the negative "-" battery connection.Use of a bus bar ensures that the Electronic Control Module (ECM) and all of the components that are connected to the ECM have a common reference point.