TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0003 00 0003 00-22 THEORY OF OPERATION (Contd) ELECTRICAL SYSTEMS OPERATION Wires with circuit numbers are shown here for reference only and are not to be used for troubleshooting. BATTERY AND WIRING SYSTEM Battery System Operation: The batteries are wired in series thereby utilizing two 12V batteries to create a 24V system. The batteries are positive grounded directly to the chassis frame. The negative battery cable is connected to the starter motor solenoid terminal, and voltage is supplied to the main wiring harnesses from the solenoid terminal. The major components are as follows: BATTERY – Two type 6TMF batteries store and supply electrical energy. They provide 24 volts DC for the starting system and electrical accessories. SLAVE RECEPTACLE – Provides a convenient place to plug in an external power source to assist in cranking the engine. Used when vehicle batteries are not sufficiently charged. ACCESSORY POWER SWITCH – Connects or disconnects the batteries from the vehicle electrical components. C B A A B C 7 14 10 11 27 1 49 50