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MIL-T-62320C
weatherproof slave receptacle for receiving external power and grounding the vehicle. A three-
wire connecting cable, 25 feet long and of adequate line capacity to supply power for all heater
units simultaneously, shall be furnished. The connecting cable shall include a matching female
connector at the vehicle end and a standard, weatherproof, three-pronged (two power plus one
ground) male connector at the other end. Electrical insulation of the connecting cable shall
withstand normal operating stresses in low ambient air temperatures (down to minus 60F)
without cracking or loss of dielectric capacity. All heater lead wires shall be installed without
interfering with vehicle component operation, and without loose excess wire. Provisions for
stowage of the cable shall be provided in the vehicle cab. Heaters shall be furnished as follows:
(a)
A coolant heater, 1500-watt minimum rating, shall be installed in the engine block or
lower coolant inlet hose. An engine thermostat with an operating range of 170F to
195F shall be installed
An immersion type engine oil heater, 300-watt minimum rating, with 170oF to 195oF
(b)
thermostat, shall be installed in the oil pan through any convenient opening
(c)
The 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 the
electrolyte to not more than 80F
(d)
A fuel warmer or preheater 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 aide of the fuel warmer unit.
3.4.2 Electrical systems. The electrical systems 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 12- or 24-volt direct current
(dc) starting system with a 12-volt dc lighting system, and with not less than a 60-ampere
alternator, shall be furnished. Engine starting equipment shall include an ether starting system or
glow plug. If an ether 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
replaceable ether reservoir of not less than 12 fluid ounces shall be furnished. A reservoir need
not be furnished.
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