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|  MIL-T-62110G
female connector at the vehicle end and a standard, weatherproof, three-pronged (two power plus
one ground) male connector at the other end. Electrical apparatus shall conform to Federal
Motor Carrier Safety Regulation 393.77(c)(7). 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. Provision for
stowing the cable shall be provided inside 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. Engine coolant thermostat with an operating range of 70F
to 195F shall be installed
(b) An immersion type engine oil heater, 300-watt minimum rating, with 170F to 195F
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) When an auxiliary gasoline engine (see 3.15) is provided, a 300-watt immersion type
heater with 170F to 195F thermostat shall be installed in the oil pan through any
convenient opening
(e) 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 side of the fuel warmer
unit.
*
3.4.1.10 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 60F 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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