TM 9-2330-359-14&P1-7. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.M879A2 SHOWNKeyComponentDescription112-volt ElectricalConnects semitrailer 12-volt electrical system to towing vehicle.Receptacle (All ExceptM872A1)124-volt ElectricalConnects towing vehicle 24-volt electrical system, with voltageReceptacle (M872A1)reduction, to semitrailer 12-volt electrical system.2Nose BoxContains light circuits and electrical and air connectors.3SwitchActivates semitrailer emergency flashers.(All Except M872)424-volt ElectricalConnects towing vehicle 24-volt electrical system, with voltageReceptacle (All Exceptreduction, to semitrailer 12-volt electrical system.M872A1)412-volt ElectricalConnects semitrailer 12-volt electrical system to towing vehicle,Receptacle (M872A1)5Emergency Air CouplingConnects to towing vehicle to provide emergency air supply.6Landing LegsSupport front of semitrailer when uncoupled from towing vehicle.7HandcrankOperates landing gear legs.8Service Air CouplingConnects to towing vehicle to provide service air supply.9Pamphlet BoxProvides stowage for semitrailer technical manual.TA5079741-3
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