1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. - Continued
The fire truck is equipped with a 12-volt dc main electrical system and a 110-volt ac auxiliary system. All
components and subsystems used to operate and control the truck and firefighting equipment are powered from the 12-
volt system. The 110-volt ac system is used to operate auxiliary power tools and accessories.
The 110-volt ac system consists of a 12-Vdc to 110-Vac Inverter connected to the main engine alternator.
Four receptacles are mounted on the left and right sides of the hose body, (see fig. 1-10). An additional two 110-Vac
receptacles are available on the inverter itself.
The 12-volt system consists of four maintenance-free batteries located in the battery compartment. The
batteries are connected to a battery switch in the cab. To maintain the charge of the batteries, two 12-volt, 80-amp
alternators, driven by the main engine, are provided. All of the major components and circuits are protected by
automatic-reset-type circuit breakers. To provide 24-Vdc to auxiliary radio equipment the truck is equipped with a 12to
24-Vdc converter. The converter is connected to the truck batteries via the battery switch.
Figure 1-10. Electrical System Components