TM 9-2320-280-20-11-24. BATTERY SYSTEM OPERATIONThe battery system is identical for all vehicles covered in this manual and consists of the following circuitsand components.CIRCUIT 6A- Connects the batteries to the starter and to the protective control box throughcircuit 74A.BATTERIES - Two 6TN batteries are connected to provide 24 volts D.C. for the electrical startingsystem.SLAVE RECEPTACLE - Links an external power source directly to the slaved vehicle’s batteries toassist in cranking the engine when the vehicle’s batteries are not sufficiently charged.SHUNT - Used when measuring current draw from batteries utilizing STE/ICE-R.PROTECTIVE CONTROL BOX - Protects the vehicle electrical system in the event the batterysystem polarity is reversed.ROTARY SWITCH - When in "START" position actuates starter solenoid through circuit 11A and74A. When in "RUN" position closes circuit 29A to activate instrument cluster gages through circuit 27.CIRCUIT 7A- Connects the battery system to the starter negative terminal and chassis ground.STARTER SOLENOID- Actuates starter motor gear to crank vehicle engine.1-43
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