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Receptacle for 24-volt dc system. |
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|  MIL-S-45152H
protected) or on the semitrailer bumper. Turn signal lamps shall conform to SAE J588. All
electrical wiring shall conform to SAE J1292. When specified and only when specified
(see 6.2), clearance, side marker and identification lamps shall be constructed for easy removal
and replacement of lamps and lenses without the use of any tools. Otherwise, if the option is not
specified, the use of tools shall be required to minimize pilferage of lamps and lenses.
3.17.1 Twelve-volt dc system. A 12-volt dc lighting system conforming to 3.17 and 3.17.2
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.
3.17.2 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.
3.17.3 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 3.17. The
24-volt dc system shall also conform to the Federal Motor Carrier Safety Regulations referenced
in 3.17.1, except the 24-volt dc stop and turn lamps shall be combined.
3.17.4 Interconnected 24-volt dc system. When specified (see 6.2), capability of operating
the normal 12-volt dc system (see 3.17.1) from a towing vehicle equipped with a nominal 24-volt
dc electrical system shall be provided.
3.17.5 Receptacle for 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 MS75021, part number 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).
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