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 60°F)
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 70°F to 195°F shall be installed
(b) An immersion type engine oil heater, 300-watt minimum rating, with 170°F to 195°F
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 10°F during vehicle exposure in ambient air temperatures as low as minus 60°F, and shall embody a thermostat to limit the temperature of the electrolyte to not more than 80°F
(d) When an auxiliary gasoline engine (see 3.15) is provided, a 300-watt immersion type
heater with 170°F to 195°F 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 40°F to an outlet temperature of plus 9°F, 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 60°F and shall heat the engine to plus 40°F from minus 60°F 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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