SECTION III: PRINCIPLES OF OPERATIONTM 92350-256-202Generator voltage regulators. The M88A1 has either a single or dual voltage system. In the dual system -there aretwo solid-state generator voltage regulators which maintain generator output voltage at a constant 28 + 0.7 V dc.One controls the generator voltage output of the engine and the other the generator voltage output of the APU. Inthe single system, a single voltage regulator controls both the engine and APU generator voltage output. Thevoltage regulators are mounted at the left rear of the engine compartment.3Starter assembly. The 24-V, waterproof starter assembly is mounted on the lower left side of the engine toward therear. It is a heavy-duty, solenoid-operated, enclosed, shift-lever-type engine starter. The motor utilizes 12 brushesretained in 6 brush holders which are accessible through inspection plugs in the motor frame. The drive clutch is aheavy-duty, over-running type with adjustable pinion clearance.4 Neutral safety switch. The neutral safety switch, mounted on the brake assembly, functions as a safety switch toprevent starting the engine while the transmission shift control is in any shift position other than P (park).5Master relay. The master relay is located in the left rear of the engine compartment. It controls primary power to allelectrical systems and components with the exceptions of the personnel heater system, the MASTER switch, andthe slave receptacle.6Batteries. Six 12-V batteries are connected in a series-parallel circuit to give the vehicle a 300-A-hr source of 24-Vdc power. The batteries are located in the left side of the engine compartment.b.GAGE AND SWITCH PANELS1Gage panel (located to the left of the steering control at the driver's position). The gage panel mounts the following:Fuel level gageEngine and transmission temperature and pressure gagesBattery generator indicatorSpeedometer and tachometerMechanical transmission oil pressure warning lightMaster warning lightThree instrument panel lightsFuel selector switch2Switch panel (located to the right of the driver's steering control). The switch panel mounts the following:Main light switchAuxiliary light switchFuel cutoff switchFuel pump switchFive circuit breakersMaster relay indicator lightMASTER switchBlackout (B.O.) selector switchc.SENDING UNITS AND WARNING INDICATORS1Sending units. Sending units for the gage panel are mounted on the engine, transmission, and forward and rightrear fuel tanks to indicate the engine and transmission oil temperatures, pressures, and fuel levels.1-25
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