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|  MIL-S-45152H
The remaining contacts shall not be connected. Circuits B and J on tactical (military design)
trucks are combination stop and turn indicator circuits. On the interconnected 24-volt dc system,
the normal 12-volt dc turn signal lights will function both as turn signals and stop lights, and the
normal 12-volt dc stop lights will not be operational when the semitrailer is connected to a
towing vehicle with a 24-volt dc power supply. Because of this condition, the stop light (red)
circuit is not connected to the 24-volt, 12-contact receptacle.
3.17.6 Resistors. When an interconnected 24-volt dc system is specified (see 3.17.4), the
12-contact receptacle shall be provided with resistance in each circuit to reduce the voltage of a
tactical towing vehicle from a nominal 28 volts dc to 12 volts dc. Each circuit resistor shall be
selected to reduce the voltage of the tactical truck to within the maximum rated voltage of the
semitrailer electrical components. The resistor assembly shall be located in a protective housing
and provided with adequate ventilation or a heat sink to prevent overheating and any heat
damage to resistors, wiring, or adjacent components.
* 3.18 Mud flaps. Mud flaps shall be provided to the rear of the rear wheels, in accordance
with SAE J682. A metal strip not less than 1/8 inch thick and not less than one inch wide,
extending the entire width of the mud flap, shall be installed to prevent the bolt heads or bolt nuts
from damaging the mud flap. As an alternate method of attaching the mud flaps, tabs or clips
with minimum surface contact dimensions of 1 inch high by 1-1/4 inch wide by 3/32 inch thick
shall be furnished at each bolt.
* 3.19 Rear end protection. The semitrailer rear end protection shall be in accordance with
Federal Motor Carrier Safety Regulation 393.86. When specified (see 6.2), a heavy duty
reinforced bumper plate shall be provided at the rear for protection against damage when backing
and for use when the semitrailer is pushed from the rear to assist in traveling over unimproved
roads. The bumper shall withstand the forces imposed during pushing of the fully loaded
semitrailer under severe operating conditions without damage to structural members, lights,
reflectors or other components.
* 3.19.1 Push bumper. On class B folding gooseneck semitrailers, a heavy duty reinforced
bumper plate, centrally located and approximately flush with the rear of the semitrailer, shall be
provided. The bumper plate shall allow truck tractor bumper contact during disabled vehicle
winch loading operations, without damage to the truck tractor or semitrailer.
3.20 Servicing and adjusting. Prior to acceptance by the Government inspector, the
contractor shall service and adjust the semitrailer for operational use including at least the
following: adjustment of electrical and brake systems; inflation of all tires; and complete
lubrication with grades of lubricants recommended for the ambient air temperature at the
delivery point.
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