MIL-S-62076 Semitrailer Chassis: Intermodal Cargo Container Carrying, Commercial And Container, Cargo: Intermodal, Demountable, CommercialThis specification covers 20 and 40 foot semitrailer chassis and 20 and 40 foot demountable closed cargo containers intermodal type for transporting and storage cargo. The semitrailer chassis and demountable containers may be procured as a combined unit or as individual items to supplement an existing system. The semitrailer chassis are of the tandem axle type and have minimum gross weight ratings of 51,050 pounds for the model A, 20 foot chassis, 74,500 pounds for the model B, 40 foot chassis, and 75,800 pounds for the model C, 40 foot chassis. Items procured under this specification are commercial items which shall be warranted by the manufacturer as specified in procurement documents.

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MIL-S-62076B(AT)

24-volt dc system shall also conform to the Federal Motor Carrier Safety Regulations referenced in 3.4.9.2, except the 24-volt dc stop and turn lamps shall be combined.

3.4.9.4 Interconnected 24-volt dc system. When specified (see 6.2), capability of operating the 12-volt dc system (see 3.4.9.2) from a towing vehicle equipped with a nominal 24-volt dc electrical system shall also be provided.

3.4.9.5 Receptacle, 24-volt dc. When either an independent or interconnected 24-volt dc system is specified, the front of the semitrailer chassis shall also be equipped with a l2-contact receptacle and cover conforming to MS75021-1. The receptacle shall be located in accordance with SAE J702. The 24-volt dc, 12-contact receptacle shall be connected to the lights as follows:

Contact B. Connect to left-hand turn signal and stop lamp (yellow). Contact D. Connect to ground (white).

Contact E. Connect to clearance, side marker, identification, and tail lamps

(black and brown).

Contact J. Connect to right-hand turn signal and stop lamp (green).

Contact L. Connect to ground (white).

The rest of the contacts shall not be connected. Circuits B and J on tactical trucks are combination stop and turn indicator circuits. On the interconnected 24-volt system, the normal l2-volt dc turn signal lights will function both as turn signals and stop lights, and the normal

l2-volt dc stop lights will not be operational when the semitrailer chassis 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 dc, l2-contact receptacle.

3.4.9.6 Resistors. When an interconnected 24-volt dc system is specified (see 3.4.9.4), the

12-contact receptacle shall be provided with resistance in each circuit to reduce the voltage of the tactical (military design) towing vehicle from a nominal 24 volts dc to 12 volts dc. Each circuit resistor shall be selected to reduce the 28-volt dc regulated voltage of the tactical truck to be compatible with the maximum rated voltage of the semitrailer chassis electrical components.

The resistor assembly shall be located in a protective housing and provided with adequate ventilation or a beat sink to preclude overheating and any damage to resistors, wiring, or adjacent components.