MIL-DTL-82001F
3.4.3 Cable dimensions. The cable shall be molded into a cylindrical coil incorporating spring-like
properties, so that following extension, the cable will retract to its original shape. The cable length from
the 12-contact cable connector plug to the voltage control unit shall be not less than 2 feet (.610 m) when
extended, and the coil length shall be not more than 6 inches (15.24 cm) when the cable is retracted. The
cable length from the voltage control unit to the 7-contact cable connector plug shall be not less than 10
feet when extended and the coil length shall be not more than 2 feet (.610 m) when the cable is retracted.
Cable shall be marked for identification by either painting or embossing during manufacturing process.
3.4.4 Voltage control unit. The voltage control unit shall adapt the 24V truck potential to the 12V trailer
requirements. The voltage control unit shall incorporate a rotary selector which, by selective positioning,
will insert the required resistance in the marker, clearance, and tail lamp circuit for the various trailer lamp
requirements indicated herein. Selector positions shall include resistance values for 8, 10, 12, 14, and 16
lamp circuits of 4 candlepower per each position appropriately marked according to the number of lamps
in the circuit. The stop lamp circuits provide for two 21 candlepower lamps. Right and left turn signal
circuits shall each provide for one 21 candlepower lamp. The auxiliary circuit shall provide for two 21
candlepower lamps. Circuits shall be based on standard SAE lamp bulb ratings. Resistors shall be of the
wire-wound type and rated for the wattage required to be dissipated. All electrical components and wiring
shall be mechanically and electrically secure from damage due to severe vibration and shock. The
voltage control unit shall be mounted in a weather-resistant, metal enclosure. The enclosure shall be
provided with mounting brackets for the purpose of mounting the voltage control unit on military-type
towing vehicles.
3.4.5 Circuit continuity. Conductors shall be connected through the voltage control unit to the
respective contacts on each cable connector plug, as indicated in table I, to provide continuity of the
electrical circuits from the towing vehicle to the towed vehicle.
TABLE I. Interconnection of contacts on respective cable connector plugs.
12-contact plug
7-contact plug
Wire
Circuit function
(MS75020-1)
(SAE J560)
Color
Ground return to towing vehicle
D
1
wht
Marker, clearance, and tail lamps
E
2 and 6
blk & brn
Left turn directional signal
B
3
yel
Stop
F
4
red
Right turn directional signal
J
5
grn
Auxiliary circuit
K
7
blu
3.5 Treatment and painting. Treatment and painting shall be in accordance with the manufacturer's
standard commercial practice.
3.6 Identification markings. The cable assembly shall be marked for identification in accordance with
MIL-STD-130.
3.7 Workmanship. The cable assembly shall be fabricated in accordance with the current state-of-the-
art practices of the industry. Metal surfaces shall be smooth and free from sharp edges. Component
parts shall be securely mounted and arranged for accessibility.
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