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Receptacle far 24-volt dc system. |
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|  MIL-S-62294B(AT)
3.16.1 Twelve-volt direct current (dc) system. A 12-volt dc lighting system conforming to
3.16 and 3.16.2 shall be provided. The 12-volt dc lighting system shall conform to Federal
Motor Carrier Safety Regulations 393.14, 393.20, 393.22, 393.23, 393.25 through 393.29,
393.32 and 393.33.
3.16.2 Receptacle for 12-volt dc system. The front of the semitrailer shall be equipped with
a 7-contact receptacle conforming to SAE J560 with the connectors connected and color coded
as specified therein. The receptacle shall be provided with a spring loaded cover. The receptacle
shall be located in accordance with SAE J702.
3.16.3 Independent 24-volt dc system. When specified (see 6.2), a 24-volt dc lighting
system, independent of the 12-volt dc lighting system, shall be provided. Separate wiring and
bulbs shall be provided for the 24-volt dc system. The system shall conform to 3.16. The
24-volt dc system shall also conform to the Federal Motor Carrier Safety Regulations referenced
in 3.16.1, except the 24-volt dc stop and turn lamps shall be combined.
3.16.4 Interconnected 24-volt dc system. When specified (see 6.2), capability of operating
the 12-volt do system (see 3.16.1) from a towing vehicle equipped with a nominal 24-volt dc
electrical system shall be provided.
3.16.5 Receptacle far 24-volt dc system. When either an independent or interconnected
24-volt dc system is specified, the front of the semitrailer shall also be equipped with a
12-contact receptacle and cover conforming to MS 75021, part number MS 75021-1. 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 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.
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