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Auxiliary 24-volt system with trailer receptacle |
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|  MIL-T-62491C
3.4.2.7 Auxiliary 24-volt system with trailer receptacle. When specified (see 6.2), an
auxiliary 24-volt system with a trailer receptacle shall be furnished. Either a converter type
(see 3.4.2.7.1) or an alternator type (see 3.4.2.7.2) system meeting specified requirements shall be
furnished. A trailer receptacle, conforming to MS 75021-2, with cover assembly, shall be
provided in an accessible location on the rear end of the vehicle. A twelve-conductor truck
tractor cable, not less than 2800 mm (110 inches) long, with both ends of the cable equipped with
connectors conforming to MS 75020-1 and MS 75020-2, shall be furnished. The cable assembly
shall be stowed in the vehicle. The 24-volt, 12-ampere output service lighting circuit shall be
connected through the appropriate lighting controls to terminals B, D, E, J and L of MS 75021-2.
* 3.4.2.7.1 Converter type 24-volt system. The 12- to 24-volt converter(s) shall operate from
the 12-volt battery (see 3.4.2.7). The output capacity shall be not less than 24 amperes. More
than one converter may be provided to furnish a total of 24 amperes.
3.4.2.7.2 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 24-ampere rated capacity and capable of
providing not less than 7 amperes 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 20-ampere hour capacity at a 20-hour rate
(c) Voltage regulating device
(d) An ammeter for the 24 volt system, mounted on the instrument panel.
* 3.4.2.8 Radio interference suppression. The vehicle shall be suppressed to limit the
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 Fue1 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). Fuel tank(s) for class 10 wreckers shall have not less than 75.6 L
(20 gallons) total capacity. All other classes of wreckers shall be equipped with step type fuel
tank(s) of not less than 189 L (50 gallons) total capacity (163 L (43 gallons) for vehicles destined
for California). Except for class 10, 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, or on class 10 vehicles (diesel or
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