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Receptacle for 24-volt dc system |
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|  MIL-S-62359(AT)
3.4.8 Lighting. All lights and reflectors shall be protected from operational hazards by
mounting in recessed or otherwise guarded locations. Lights and reflectors shall not be mounted
on vertical surfaces of the rub rail (unless recessed and fully protected) or on the semitrailer
bumper. Turn signal lamps shall conform to SAE J588. All electrical wiring shall conform to
SAE J1292. Clearance and identification lamps shall be constructed for easy removal and
replacement of lamps and lenses without the use of hand tools.
3.4.8.1 Twelve-volt direct current (dc) system. A 12-volt dc lighting system conforming
to 3.4.8 and 3.4.8.2 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.
3.4.8.2 Receptacle for 12-volt dc lighting 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.
3.4.8.3 Independent 24-volt dc system. When specified (see 6.2), a 24-volt de 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 3.4.8. The
24-volt dc system shall also conform to the Federal Motor Carrier Safety Regulations referenced
in 3.4.8.1, except the 24-volt dc stop and turn lamps shall be combined.
3.4.8.4 Interconnected 24-volt de system. When specified (see 6.2), capability of
operating the 12-volt dc system (see 3.4.8.1) from a towing vehicle equipped with a nominal
24-volt de electrical system shall be provided.
3.4.8.5 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)
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