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|  MIL-S-62101C
bumper. All electrical wiring shall conform to SAE J1292. Clearance and identification lights
shall be constructed for easy removal and replacement of lamps and lenses without the use of any
tools.
3.16.1 Receptacle, 12 volt direct current (dc). 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.
3.16.2 Twelve-volt dc system. A 12-volt dc lighting system conforming to 3.16 and
3.16.1 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.
3.16.3 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 3.16.2, 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 dc system (see 3.16.2) from a towing vehicle equipped with a nominal
24 volt dc electrical system shall be provided.
3.16.5 Receptacle, 24-volt dc. 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 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 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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