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* Power plant, transmission and drive unit heaters. A coolant heater, an engine oil
heater, a transmission heater and a drive unit heater shall be provided. Unless otherwise
specified (see 6.2), a battery heater shall be provided. Heaters shall operate on 110 volts
alternating current (ac), and shall be wired through a junction block to a single three-pronged
(male), weatherproof, slave receptacle for receiving external power and grounding the vehicle.
A three-wire connecting cable, 25 feet long and of adequate line capacity to supply power for all
heater units simultaneously, shall be furnished. 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. 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. Provisions for stowage of the cable shall be
provided in the vehicle cab. Heaters shall be furnished as follows:
(a) A coolant heater, 1,500-watt minimum rating, shall be installed in the engine block
or in the lower coolant inlet hose. An engine thermostat with an operating range of
170 F 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 engine oil pan through any convenient
(c) An immersion type oil heater, 300-watt minimum rating with 170F to 195F
thermostat, shall be installed in the transmission lower pan
(d) An immersion type oil heater, 300-watt minimum rating with 170F to 195F
thermostat, shall be installed in the drive unit
(e) A battery heater with a capacity adequate to maintain the battery electrolyte at a
temperature of not less than 10F during vehicle exposure in ambient air temperature
as low as minus 60F, and with a thermostat to limit the temperature of the
electrolyte to not more than 80F.
3.4.2 Electrical system. The electrical system shall be of 12-volt direct current (dc)
potential. The manufacturer's standard commercial storage battery(s), dry charged and moisture
sealed, shall be provided. Electrolyte shall not be furnished. An alternator with a rating of not
less than 60 amperes shall be provided.

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