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|  MIL-T-62079E
units simultaneously, shall be furnished. The connecting cable shall include a matching female
connector at the vehicle end and a standard, three pronged (two power plus one ground) male
connector at the other end. All electrical apparatus shall conform to Federal Motor Carrier
Safety Regulation 393.77(c)(7). Electrical insulation of 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. A carrier for the connecting cable
shall be mounted within the cab or engine compartment and shall provide positive cable retention
during vehicle operation. Heaters shall be furnished as follows:
(a)
A coolant heater, l500-watt minimum rating, shall be installed in the engine block
or lower coolant inlet hose. An engine thermostat with an operating range of l70F
to 195F shall be installed
(b)
The battery heater shall have a capacity adequate to maintain the battery electrolyte
at a temperature of not less than l0F 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
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 Ignition system. An ignition system of 12-vo1t direct current (dc) potential shall be
furnished. An alternator of not less than 55 amperes dc output shall be furnished. The maximum
constant electrical load, including the radio, shall not exceed 80 percent of the maximum output
capacity of the alternator furnished. The vehicle radio electrical load is established at 7 amperes
for monitor and 18 amperes for transmission. The using activity will furnish and install the
radio.
3.4.2.2 Battery. The battery shall be of 12-volt potential. The reserve capacity rating,
measured in accordance with SAE J537, shall be not less than 80 minutes. The cold cranking
rating at 0F, measured in accordance with SAE J537, shall be not less than 350 amperes. The
battery shall be of the maintenance-free type having the maintenance-free characteristics listed in
W-B-13l.
3.4.2.3 Auxiliary 24 volt system with radio outlet. When specified (see 6.2), an auxiliary
24 volt system with a shielded wiring harness and radio outlet with cover shall be furnished. The
receptacle and cover shall conform to Drawings 7722352 and 7261674, and shall be marked with
a pressure sensitive label: "24-VOLT RADIO OUTLET." The receptacle shall be located on the
side opposite the driver, on the instrument panel in the cab. The shielded wiring harness shall be
connected to the receptacle and to a 12-volt to 24-volt converter. The converter shall operate
from the 12-volt battery (see 3.4.2.2) and shall have an output capacity of not less than
25 amperes.
7
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