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|  MIL-T-62021E(AT)
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3.4.2.3 Alternator. Unless otherwise specified (see 6.2) on diesel engine driven vehicles,
a minimum 15-ampere alternator shall be furnished. The alternator output with the engine at
engine idle speed shall be not less than 45 amperes. Unless otherwise specified (see 6.2) on
gasoline engine driven vehicles, an alternator of not less than 85 amperes rated capacity, and
which provides not less than 45 amperes dc output at normal engine idle speed, shall be furnished.
3.4.2.4 Lighting. All vehicle lights, reflectors, and wiring shall conform to Federal Motor
Carrier Safety Regulations 393.12, 393.19, 393.20 and 393.22 through 393.26(d). Lights and
reflectors shall not be mounted on vertical surface of rub rails (unless recessed and fully
protected) or mounted on vehicle bumpers.
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3.4.2.5 Turn signal. Turn signal lamps shall conform to SAE J588. Operating units shall
conform to SAE J589, class A, and shall be mounted on the steering column. The turn signal
units shall be installed in accordance with SAE J588. Turn signal operating units shall have a
visible flash indicator.
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3.4.2.6 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
ratings and the total cold cranking ampere ratings at -18C (0F), both measured in accordance
with SAE J537, shall be not less than specified in table I. The batteries shall be of the
maintenance free type having the maintenance free characteristics listed in W-B-131.
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TABLE I.
Batteries.
Reserve capacity
Cold cranking
Engine type
(minutes)
(amperes)
Diesel
480
1,875
Gasoline
100
450
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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 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.
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3.4.3.2 Fuel tank(s). The fuel tank shall be not less than 189 L (50 gallon) total capacity
163 L (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 equalized fuel level in both
tanks. When more than one tank is furnished on gasoline engine driven vehicles, a selector valve
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