TM 9-2350-247-20-1THEORY OF OPERATION — Continued 0003 00ELECTRICAL SYSTEMA 24 volt direct current system supplies electrical current for the carrier. The M548A1 has two 12 volt wet-cell batteries, withan amperage capability of 100 amps per hour and connected in series. The M548A3 has four 12 volt wet-cell batteries with anamperage capability of 200 amps per hour and connected in series parallel.The batteries supply the carrier with electricity. The vehicle compartment heater, cargo compartment heater kit, coolant heaterkit, and engine starter are connected directly to the carrier batteries. See your –10 for location of all heaters. Electrical powerflows from the batteries through the bus bar, cables, and wiring assemblies to the electrical equipment. The hull is a groundfor the electrical system.Battery drain is replenished and system voltage is maintained by an alternating current generator, which has 100 amps perhour capability in the M548A1 carrier and 200 amps per hour capability in the M548A3 carrier. The battery recharge currentflow is regulated by the generator-regulator on top of the engine.There are several electrical subsystems within the hull. Each subsystem contains at least one wiring assembly. A majorelectrical subsystem with assemblies is exterior lights, which include blackout lights, stoplight, and headlights, and interiorlights, which include dome lights and panel lights.GENERATORThe generator is part of the carrier electrical system. It is driven by the transfer gearcase on the M548A1. On the M548A3,the generator is driven by a pulley on the crankshaft of the engine. The generator charges the batteries in the carrier when theengine is running. A regulator mounted on top of the engine keeps the voltage at correct levels.0003 00-10
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