DIE G. 1P3000 - Caterpillar

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Charging System and Starting System component connections
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Power Fuses located on the right side of the engine (1) Alternator fuse (80A) (2) Main power fuse (80A) (3) Glow plug fuse (60A) (4) Starter relay fuse (60A) (5) Engine ECM fuse (30A) (6) Reserve fuse (80A)The components in the charging system should be inspected on a regular basis. The Alternator circuit connections should be inspected to ensure that the connections are free of dirt and corrosion. Verify that each connection is tight. The condition and the tension of the drive belt should be checked in order to ensure that the Alternator is operating in the correct RPM range.The condition of charge in the batteries at each regular inspection can be an indication of how the charging system is operating. Check the condition of the battery cables and connectors. Ensure that the connectors and battery terminals are clean and in good condition. Verify that the connections are tight.An adjustment is necessary when the batteries are constantly in a low condition of charge or a large amount of water is needed. A large amount of water would be more than 29 milliliter (1 ounce) of distilled water per cell per week or per every 100 service hours. There are no adjustments on maintenance free batteries.If an event for "High System Voltage" (EID 0050) or an event for "Alternator Is Not Charging" (EID 0179) is activated, the components that make up the charging system need to be inspected and tested.If an "Alternator Is Not Charging" (EID 0179) event is activated, check the following components:
Verify that the 80 amp Alternator Power Fuse is not open.
With the key start switch in the ON position, measure the voltage between the D+ terminal (wire 309-GY) and frame ground. A voltage of more that 0.2 VDC should be present. If less voltage or no voltage is present, check the Alternator Resistor for an open.
Verify that the Alternator "R" terminal input circuit (wire 403-GN) to the Machine Control ECM is connected, is not open or is not shorted to another circuit.
Check the output of the Alternator. Refer to the "Charging System Troubleshooting" publication that is listed below.If a "High System Voltage" (EID 0050) event is activated, the output of the Alternator should be tested. Refer to the "Charging System Troubleshooting" publication that is listed below.For load testing the batteries, refer to Special Instruction, SEHS7633, "Battery Test Procedure". For testing the components in the charging system, refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for the correct procedures to use in order to test the charging system. This publication also contains the specifications to use when testing the charging system.