A-A-58009B
at least four gear ratios without movement of the selector. The net torque capacity and the net
power rating of the transmission shall exceed the output ratings of the engine.
2.2.9 Traction control. The vehicle shall be equipped with limited slip, automatic locking, or
driver controlled, air actuated, locking differentials in the rear axle and between the axles.
2.2.10 Fuel tank. Fuel tank(s) having a minimum usable capacity in accordance with 10-3.4.1 of
NFPA 1901 or 50 gallons, whichever is greater, shall be provided. The location of the fuel
tank(s) shall protect it (them) from mechanical damage during normal use of the vehicle.
2.2.11 License plate bracket. A lighted license plate bracket shall be provided at the left rear of
the vehicle.
2.3 Low-voltage electrical systems. The vehicle shall have a 12 volt electrical and starting
system.
2.3.1 Alternator. A single alternator charging system in accordance with 11-3 of NFPA 1901
shall be provided. The minimum continuous electrical load shall include operation of the air
conditioning system.
2.3.2 Batteries. Batteries shall be of the maintenance-free type; addition of water shall not be
required during normal service life. The battery cover and vent system shall be designed to
prevent electrolyte loss during service and to keep the top of the battery free from electrolyte.
2.3.2.1 Battery compartment. The batteries shall be mounted in an acid-resistant tray and shall be
enclosed in a weatherproof box or compartment.
2.3.3 Battery charger or conditioner. The vehicle shall have a DC taper type battery charger or an
automatic battery conditioner, providing a minimum 15 amp output. The charger/conditioner
shall be permanently mounted on the vehicle in a properly ventilated, accessible location. The
charger/conditioner shall be powered from the electrical shoreline receptacle (see 2.6.2). A
charging indicator shall be installed next to the receptacle. When a battery conditioner is
provided, it shall monitor the battery state of charge and, as necessary, automatically charge or
maintain the batteries without gassing, depleting fluid level, overheating, or overcharging.
2.3.4 Warning lights. All warning lights shall use strobe type or light emitting diode (LED)
elements. The warning light system, related components, and devices shall be in accordance with
11-8 of NFPA 1901.
2.3.4.1 Light bar. A six element strobe-type light bar, with both forward and side facing strobe
heads, shall be mounted on the cab roof. Forward facing lenses shall be red-white-red-red-white-
red, with the white lights switched off in blocking right-of-way mode. Rearward facing lenses
shall be red-amber-red-red-amber-red. The light bar shall be separately switched from the
warning light panel.
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