TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 54 of 1205
TM 9-2320-387-24-l l-23. BATTERY SYSTEM OPERATION The battery system is identical for both vehicles covered in this manual and consists of the following circuits and components: 0 A 0 B 0 C 0 D 0 E 0 F 0 G 0 H CIRCUIT 6A - Connects the batteries to the starter and to the protective control box through circuit 8% BATTERIES - Two 6TN batteries are connected to provide 24 volts DC for the electrical starting system. SLAVE RECEPTACLE - Links an external power source directly to the slaved vehicle’s batteries to assist in cranking the engine when the vehicle’s batteries are not suffkiently charged. SHUNT - Used when measuring current draw from batteries utilizing STEACE-R. PROTECTIVE CONTROL BOX (PCB) - Protects the vehicle electrical system if the battery system polarity is reversed. Provides frequency lockout, load dump, glow plug operation, and interfacing of engine body harnesses. ROTARY SWITCH - When in START position, actuates starter solenoid through circuits 1lA and 744. When in RUN position, closes circuit 29A to activate instrument cluster gauges through circuit 27. CIRCUIT 7A - Connects the starter negative terminal to engine ground while circuit 7E connects shunt to engine ground. STARTER SOLENOID - Actuates starter motor gear to crank vehicle engine. 27 * l-30