ARMY TM 9-6115-670-14&P
1-20
1.16.6. Electrical System. The engine's electrical system (Figure 1-8) consists of a starter system
(including an electromagnetic drive type starter and glow plugs) and a charging system (including the AC
alternator and regulator). The PREHEAT/START switch on the APU controller starts the engine. In the
PREHEAT position, current from the vehicle battery is supplied to the glow plugs in each combustion
chamber ensuring easy start-up. In the START position, current is supplied to the starter. The alternator
is an 8-8 rotating magnet AC generator. The regulator performs rectification and voltage regulation. It
converts alternator AC output to DC which flows through the power consuming circuits. DC is also fed
back to the vehicle to charge the vehicle battery when the vehicle engine is not running. If the DC
voltage is excessive, the DC current is cut off from the charging circuit to prevent overcharging.
Figure 1-8. Electrical System