ELECTRICAL SYSTEM - TM-5-3805-263-14P-2

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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ELECTRICAL SYSTEM TESTING AND ADJUSTING TM 5-3805-263-14&P-2 ELECTRICAL SYSTEM 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. and the battery must be fully charged. If the on engine test shows a defect in a component. remove the component for more testing. BATTERY Electrical Tester. Battery Charger Tester. Coolant and Battery Tester. NOTE: Make reference TM 9-6140-200-14 when testing, checking or charging the battery. Never disconnect any charging unit circuit or battery circuit cable from 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. Damage to the charging unit will result, if the connections, (either positive or negative) between the battery and charg- ing unit are broken while the charging unit is charg- ing. This is because the battery load is lost and there is an increase in charging voltage. High voltage will damage, not only the charging unit but also the regulator and other electrical components. Load test a battery that does not hold a charge when in use. To do this, put a resistance across the main connections (terminals) of the battery. For a 12V battery, use a test load of three times the ampere/hour rating (the maximum test load on any battery is 500 amperes). Let the test load remove the charge (discharge) of the battery for 15 seconds and, with the test load still applied, test the battery voltage, A 12V battery will show 9V. Each cell of a battery in good condition must show 1.6V. CHARGING SYSTEM The condition of charge in the battery at each regular inspection will show if the charging system is operating correctly. An adjustment is necessary when the battery is constantly in a low condition of charge or a large amount of water is needed (more than one ounce of water per cell per week or per every 50 service hours). Make a test of the charging unit and voltage reg- ulator on the engine, when possible, using wiring and components that are a permanent part of the system. Off the engine (bench) testing will give a test of the charging unit and voltage regulator operation. This testing will give an indication of needed repair. After repairs are made, again make a test to give proof that the units are repaired to their original operating condition. Before starting the on engine testing, the charging system and battery must be checked as given in the Steps below. 1. Battery must be at least 75% (1.240 Sp. Gr.) full charged and held tightly in place. The battery holder must not put too much stress on the battery. 1-75

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