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|  MIL-T-62320C
3.4.2.6.1 Converter type 24-volt. system. The 12- to 24-volt converter(s) shall operate from
the 12-volt battery supply (see 3.4.2.6). The output capacity shall be not less than 12 amperes.
3.4.2.6.2 Alternator type 24-volt system. The alternator type 24-volt system shall be
separate from the 12-volt vehicle lighting and ignition system and shall include:
(a)
Nominal 24-volt alternator with not less than a 25-ampere rated capacity and capable of
providing not less than a 7-ampere dc output at normal engine idle speed
(b)
Two 12-volt batteries with a combined capacity of at least 40 ampere-hours at a
20-hour rate or one 24-volt battery with a capacity of at least 20 ampere-hours at a
20-hour rate.
(c)
Voltage regulating device
(d)
An ammeter, mounted on the instrument panel.
3.4.2.7 Radio interference suppression. The vehicle shall be suppressed to limit
electromagnetic radiation in accordance with SAE J551. Any body equipment emitting
electromagnetic radiation shall be suppressed to the same level as the vehicle chassis.
3.4.3 Fuel system. The fuel system shall conform to Federal Motor Carrier Safety
Regulations 393.65 and 393.67.
*
3.4.3.1 Air cleaner. An air cleaner shall be furnished.
* 3.4.3.2 Fuel tank(s). The fuel tank(s) shall have a total capacity of not less than 50 gallons
(43 gallons for vehicles destined for California). When more than one tank is furnished on diesel
engine driven vehicles, means shall be provided to assure an equalized fuel level in both tanks.
When more than one tank is furnished on gasoline engine driven vehicles, a selector valve
connecting either tank to the engine fuel intake shall be provided and means shall be provided to
monitor the fuel level of either tank from a single gage.
3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. Vertical mufflers capable of being reached easily by personnel entering or
leaving either side of the cab shall be provided with a heat shield. Vertical exhaust systems shall
be provided with a hinged rain cap.
3.4.5 Gear train.
3.4.5.1 Manually shifted transmission. Unless otherwise specified (see 3.4.5.3), a manually
shifted transmission shall be provided on the vehicle. Input torque capacity of the transmission
shall be at least equal to the maximum torque delivered by the engine. The transmission shall be
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