Electrical System -706880015

TM 5-4210-233-14&P-1

1-10. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - Continued

Figure 1-5. Fuel, Air Intake and Exhaust Systems

e. Electrical System.

(1) Refer to Electrical Schematics in Appendix H. The fire truck is equipped with a 12 VDC main electrical

system and a 110 VAC auxiliary system. All components and subsystems used to operate and control

the truck and firefighting equipment are powered from the 12 VDC system. The 110 VAC system is

used to operate auxiliary power tools, lights, and accessories.

(2) The 110 VAC system is powered by the auxiliary power unit (APU) The truck is equipped with five 110

VAC outlets. There are two double receptacles on each side of the hose body and one single receptacle

at the ladder tip.

(3) The 12 VDC system is equipped with two 12-volt batteries. Each battery is located in a separate battery

compartment. The batteries are connected to a four-position battery switch in the cab. The batteries

charge is maintained by one 160-amp engine-driven alternator. All major components and circuits are

protected by automatic reset circuit breakers.

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