YOKE AS 9R8718 - Caterpillar

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 both components must be tight.
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 through the battery outlets. Injury to personnel can be the result.
The battery circuit is an electrical load on the charging unit. The load is variable because of the condition of the charge in the battery.
Illustration 1 g02231076
177-2330 Battery Analyzer
Refer to Operating Manual, NEHS0764, "Using the 177-2330 Battery Analyzer" for detailed instruction on the use of the 177-2330 Battery Analyzer
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4C-4911 Battery Load Tester
Refer to Operating Manual, SEHS9249, "Use of 4C-4911 Battery Load Tester for 6, 8, and 12 V Lead Acid Batteries" for detailed instruction on the use of the 4C-4911 Battery Load Tester.Use the 4C-4911 Battery Load Tester or the 177-2330 Battery Analyzer in order to test a battery that does not maintain a charge when the battery is active. The 4C-4911 Battery Load Tester and the 177-2330 Battery Analyzer are portable units. The 4C-4911 Battery Load Tester or the 177-2330 Battery Analyzer can be used under field conditions and under high temperatures.Refer to Special Instruction, SEHS7633, "Battery Test Procedure" for the correct procedures to use when the battery is tested . This publication also contains the specifications to use when the battery is tested.