KKK-B-1579B
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) Coolant heater, 1500-watt minimum rating, shall be installed in the engine block or
lower, coolant inlet hose. A coolant circulating pump, driven by a 110-volt
alternating current (ac) motor, shall be provided. Engine thermostat with an
operating range of 170o to 195°F shall be installed.
(b) 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) 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 a diesel engine is furnished, 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 40oF 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.
3.4.2 Electrical system. Electrical system shall be in accordance with Federal Motor
Carrier Safety Regulations 393.27 through 393.31 and 393.33.
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3.4.2.1 Radio interference suppression. Unless otherwise specified (see 6.2), the vehicle
shall be suppressed to limit electromagnetic radiation in accordance with SAE J551. Any body
equipment emitting radiation shall be suppressed to the same level as the vehicle chassis.
3.4.2.2 Ignition system (gasoline engine). For gasoline engine driven buses, an ignition
system of 12-volt direct current (dc) potential shall be furnished. Alternator for type I, II, III, V,
VI, and VII, which provides not less than 100-ampere rated capacity and not less than 20-ampere
dc output at normal engine idle speed shall be furnished. Alternator for type IV which provides
not less than 130-ampere rated capacity and not less than 40-ampere dc output at normal engine
idle speed shall be furnished.
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3.4.2.3 Starting system (diesel engine). For diesel engine driven vehicles, a 12-volt
starting system and not less than a 130-ampere alternator which provides not less than 50-ampere
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