TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).u. AUXILIARY POWER UNIT (APU).The APU of the M992A1 is an 11.5 horsepower, 2 cylinder, 4 cycle diesel engine. It is used to power the hydraulic pumpand the APU starter/generator. The ignition, fuel shut-off switch, preheat switch, and APU engine indicators are on the APUcontrol box, located in the cargo compartment of the vehicle. The APU generator can provide enough electrical power torun the vehicle's electrical systems, as well as the electrical system of a disabled vehicle via the NATO slavecable/receptacle. The primary electrical components of the APU system are the APU control box, APU starter/generator,APU starter relay, APU fuel solenoid, APU preheat solenoid, APU fuel pumps, APU voltage regulator, and wire harnesses12329640, 12329650, 12329660, and 12330248.Change 1 2-291
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