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|  MIL-T-62497
(d) A fuel warmer or pre-heater shall be provided 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. 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. The engine
starting equipment shall include an ether starting system or a 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, shall
have a reservoir of not less than 12 fluid ounces, and shall be inoperative with the engine warm.
3.4.2.2 Lighting. The lighting system shall be a nominal 12 volts. 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). Identification, sidemarker, and clearance lights shall be of the
armored or recessed type with the exception of those lights installed on the roof of the truck cab.
Shock and vibration reduction means shall be provided to prolong the filament life of all lights.
Two stop lights, two tail lights, and two turn signal lights shall be furnished. These lights shall
be installed on the rear at a height of not more than 60 inches from the ground. The lights shall
be protected, either by recessed mounting below impact surfaces, or protected by guards equal in
strength to 6-inch diameter standard weight pipe.
3.4.2.3 Turn signals. Turn signal lamps shall conform to SAE J588. Operating units shall
conform to SAE J589, class A, and shall be mounted on each steering column. The vehicle shall
be provided with double-faced front signal units and with single-faced rear signal units, installed
in accordance with SAE J588, except that the turn signals shall not be mounted on the engine
compartment hood. Turn signal operating units shall have visible and audible type flash
indicators.
3.4.2.4 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
rating shall be not less than 320 minutes and the total cold cranking ampere rating at 0F shall
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