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|  MIL-T-11663K
(c)
Battery heater shall have a capacity adequate to maintain the battery electrolyte at a
temperature of not less than 10F during vehicle exposure in ambient air temperatures as
low as minus 60F, and shall embody a thermostat to limit the temperature of electrolyte
to not more than plus 80F
(d)
A fuel warmer or pre-heater shall be provided on diesel engine driven vehicles to prevent
clogging of fuel filters due to wax crystallization in the fuel. The fuel warmer shall use
engine coolant to transfer sufficient heat to the diesel fuel to heat it from an inlet
temperature of minus 40F to an outlet temperature of plus 9F, with a flow rate not less
than the maximum fuel demand of the engine fuel system. A coolant shutoff valve shall
be provided for the coolant inlet side of the fuel warmer unit.
* 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.
* 3.4.2.1 Starting system. For diesel engine driven vehicles, a 12or 24-volt direct current (dc)
starting system, with 12-volt dc lighting system shall be furnished. Unless otherwise specified
(see 6.2), a minimum 60-ampere alternator shall be furnished. Engine starting equipment shall
include an ether starting system or glow plug. If an other system is furnished in lieu of a glow
plug, 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 replacement ether reservoir of not less than 12 fluid
ounces shall be furnished. A reservoir need not be furnished.
3.4.2.2 Ignition system. For gasoline engine driven vehicles, a 12-volt dc ignition system
shall be furnished. Unless otherwise specified (see 6.2), an alternator of not less than a 40-ampere
rated capacity which provides not less than 16 amperes dc output at normal engine idle speed
shall be furnished.
* 3.4.2.3 Lighting. All vehicle lights and reflectors shall conform to Federal Motor Carrier
Safety Regulations 393.12, 393.19, 393.20, and 393.22 through 393.26(d). When available as the
manufacturer's standard or optional feature, the brake lights shall override the four-way
emergency flasher. Lights and reflectors shall not be mounted on vertical surface of rub rails
(unless recessed and fully protected) or mounted on vehicle bumpers.
10
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