G3500 A3 Engines Caterpillar

Proper grounding is necessary for optimum engine performance and reliability. Improper grounding will result in electrical current paths that are uncontrolled and unreliable.

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 activity that may degrade the engine electronics and communications.

• For the starting motor, do not attach the battery negative terminal to the cylinder block.

• Use an electrical ground strap to connect all metal cases that contain electrical components or electronic components to the cylinder block.

• Do not connect the negative terminal from the electrical power supply directly to the cylinder block. Connect the negative terminal from the electrical power supply to the negative terminal "−" on the interface box.

• Ground the cylinder block with a ground strap that is furnished by the customer. Connect this ground strap to the ground plane.

• Use a separate ground strap to ground the battery negative terminal for the control system to the ground plane or to earth ground.

• Rubber couplings may connect the steel piping of the cooling system and the radiator. This causes the piping and the radiator to be electrically isolated. Ensure that the piping and the radiator are continuously grounded to the cylinder block. Use ground straps that bypass the rubber couplings.

• Ensure that all grounds are secure and free of corrosion.