RETAINER 2768123 - Caterpillar

Test Tools For The Electrical System
Table 1
Tools Needed     Quantity    
6V-7070 Digital Multimeter     1    
6V-7800 Digital Multimeter     1    
8T-0900 Ammeter     1    
5P-0300 Electrical Tester     1    
9S-1990 Battery Charger Tester or 1P-7400 Battery Charger Tester     1    
1U-7297 Coolant Test Kit or 5P-3414 Retaining Ring     1    Most of the tests of the electrical system can be done on the engine. The wiring insulation must be in good condition. The wire and cable connections must be clean and tight. The battery must be fully charged. If the on-engine test shows a defect in a component, remove the component for more testing.The service manual Testing And Adjusting Electrical Components, REG00636 has complete specifications and procedures for the components of the starting circuit and the charging circuit.The 8T-0900 Ammeter is completely portable. This ammeter is a self-contained instrument that measures electrical currents without breaking the circuit and without disturbing the conductor's insulation.
Illustration 1 g00296441
8T-0900 Ammeter The ammeter contains a digital display that is used to monitor current directly within a range between 1 ampere and 1200 amperes. If an optional 6V-6014 Cable is connected between this ammeter and a digital multimeter, current readings can be viewed directly from the display of the multimeter. This can be accomplished under only one condition:
the readings are less than 1 ammeter.A lever opens the ammeter's jaws over a conductor. The conductor's diameter can not be larger than 19 mm (0.75 inch).The spring loaded jaws close around the conductor for measuring the current. A trigger switch controls the ammeter. The trigger switch can be locked into the ON position or into the OFF position.After the trigger has been working and the trigger is turned to the OFF position, the reading appears in the digital display for five seconds. This accurately measures currents in areas with a limited access. For example, these areas include areas that are beyond the operator's sight. For DC operation, an ammeter contains a zero control, and batteries inside the handle supply the power.Note: Refer to Special Instruction, SEHS8420 for more information about using the 8T-0900 Ammeter.
Illustration 2 g00283566
6V-7070 Digital Multimeter The 6V-7070 Digital Multimeter is a portable, hand-held service tool with a digital display. This multimeter is built with extra protection against damage in field applications. The multimeter is equipped with 7 functions and 29 ranges. The 6V-7070 Digital Multimeter has an instant ohms indicator. This indicator permits checking continuity for a fast inspection of the circuits. The multimeter can also be used for troubleshooting capacitors that have small values.Note: Refer to Special Instruction, SEHS7734 for complete information for the use of the 6V-7070 Digital Multimeter .Battery
Note: Refer to Special Instruction, SEHS7006 for complete information for the use of the 5P-0300 Electrical Tester.
Never disconnect any charging unit circuit or battery circuit cable from the battery when the charging unit is operated. A spark can cause an explosion from the flammable vapor mixture of hydrogen and oxygen that is released from the electrolyte