MIL-DTL-62073H(AT)
light and related harness is not to be furnished. Mid-ship turn signals are not to be furnished.
Conspicuity markings using reflective sheeting tape with extended life shall be furnished.
Commercial aluminum frame reflectors (painted before assembly) are to be used (see 4.6.3.c).
3.5.2.4 Blackout Lighting System. A blackout 24 volt LED running light system for
tail light, stop light, and turn signals (per STANAG 4381) shall be provided (ref.
12258212/19207 drawing, 24 volt). The energy emission of any trailer light source to be
illuminated in blackout mode shall be limited to the visible spectrum of 380 to 700 nanometers
(nm), with the following exception: Energy may be radiated in the 700 to 1200 nm band range
provided it is less that 1% of the energy radiated in the 380 to 700 nm band. The 24 volt lamp
assembly is to include one, yellow, solid state lamp in the center and a pair of red, solid state
lamps on each side of the center lamp. The four red lamps will appear as individual lights up to
60 feet, from 60 to 120 feet the four red lights will converge into two points of light. Lights
will be visible at 1000, plus or minus 200 feet. When trailer is on a 20 percent downgrade no
light is to be visible from an altitude which exceeds 400 feet (see 4.6.3.d).
3.5.2.5 Light Emitting Diodes (LEDs). LEDs shall be in accordance with SAE J1889.
Related electrical harness wires shall be of commercial design currently being produced and
marketed by the supplier and shall fully meet the LED light requirements described herein for
one LED running light system, operational with either 12 or 24 volt (see 4.6.3.e).
3.5.2.6 Electrical Harness Requirements. All electrical harness connections shall be
water tight, environmentally sealed, positive retention type to protect it from rain, road spray,
etc. Wiring shall be secured to prevent chaffing and loose connections (see 4.6.3.f).
3.5.2.7 Receptacles. The trailer shall be equipped with one 12-contact receptacle with
cover, and one 7-contact receptacle with cover installed at the front of the trailer. The
12-contact receptacle shall conform to MS75021-1 and be equipped with a cover assembly
conforming to drawing 7731428, nut grommet, retainer conforming to drawing 7723309, and
grommet, electrical connector conforming to drawing 7722333. The 7-contact receptacle shall
conform to SAE J560 round socket with cover for an intermediate connector cable. Both
receptacles are to be located as required by SAE J702. These receptacles are to be
interconnected without the use of circuit breakers. Interconnections between the 12-contact and
7-contact receptacles shall be as per table I below (see 4.6.3.g).
3.5.2.7.1 Receptacle circuits. Circuits B and J on tactical tractors are combination
stop and turn signal indicator circuits. The normal 12 V turn signal lights will function both as
turn signals and stop lights and the normal 12 V stop lights will not be in operation when the
trailer is connected to a towing vehicle with a 24 V power supply. Because of this condition the
number 4 stop light circuit is not connected to the 24 V, 12 contact receptacle.
3.5.3 Controls. Electrical, mechanical, and hydraulic controls shall operate without
malfunction, throughout all ranges of operation under all trailer operating conditions (see
4.6.3.h).
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