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|  MIL-T-45380E(AT)
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3.4.1.9 Fuel fired engine preheater. When specified (see 6.2), for diesel engine driven
vehicles, a diesel fuel fired engine water heater shall be furnished to preheat the engine. The
heater shall include a timer, a thermostat and a circulating pump and shall be connected to the
engine coolant system. The heater shall be capable of starting and operating at minus 60F and
shall heat the engine to plus 40F from minus 60oF in not more than 1 hour. The system shall be
equipped with a light, visible to the driver, to indicate that the preheater is operating.
3.4.2 Electrical system. The electrical system shall be in accordance with Federal Motor
Carrier Safety Regulations 393.27 through 393.31 and 393.33.
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3.4.2.1 Starting system. A 12- or 24-volt direct current (dc) starting system, with a
12-volt dc lighting system shall be furnished. Engine starting equipment shall include an ether
starting system, glow plug or electric grid heater. If an ether system is furnished in lieu of a
glow plug or grid heater, it shall be of the measured shot type. The measured shot type ether
system shall be key operated or manually operated from the driver's compartment and shall be
inoperative with the engine warm. Complete provisions for a replaceable ether reservoir of not
less than 12 fluid ounces shall be furnished. A reservoir need not be furnished.
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3.4.2.2 Alternator. Unless otherwise specified (see 6.2) on diesel engine driven vehicles,
a minimum 75-ampere alternator shall be furnished. The alternator output with the engine at
engine idle speed shall be not less than 45 amperes.
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3.4.2.3 Lighting. All vehicle lights, reflectors, and wiring shall be as specified herein
and shall conform to Federal Motor Carrier Safety Regulations 393.12, 393.13, 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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3.4.2.4 Turn signals. 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. Turn signal
units shall be installed in accordance with SAE J588. Turn signal operating units shall be
self-cancelling and shall have a visible and audible type flash indicator.
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3.4.2.5 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
ratings and the total cold cranking ratings at 0F, both measured in accordance with SAE J537,
shall be not less than specified in table II. The batteries shall be of the maintenance free type
having the maintenance free characteristics listed in W-B-131.
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