TABLE III. Military-commercial connections.
Ser. Left Turn and Stop
Ser. Tail & Marker
& Connect to
Ser. Right Turn and Stop
Ground to Frame
With the military system installed, the TTMA marker circuits, color coded BLK (2) and BRN
(6), shall be electrically isolated from each other, thus preventing 12-volt current cross-over
when operated by commercial trucks through the 12-volt TTMA plug. Replaceable diodes may
be used, having a minimum amperage of 150 percent of the current demand of the running lamps
served. Military circuits letter coded B and J on the tactical trucks are passenger car
combination stop and turn signal type, using the same lamp filament, and there is no single stop
lamp circuit. As a result, the trailer's turn signal lamp circuits, YEL (3) and GRN (5), shall
function as both turn signal lamps and stop lamps and the trailer's normal stop circuit, RED (4),
cannot be energized from the military 24-volt system input.
3.14.7 Stabilizing jacks. The semitrailer shall be equipped with not less than four
screw-action stabilizing jacks permanently attached to the chassis. The jacks shall conform to
GGG-J-51, Type I, Class 3, rated capacity 15 tons, except that the diameter of the screw shall be
not less than 2-1/2 inches. The jacks shall have steel ball-bearing caps. Detachable pads shall be
furnished. Each jack pad shall have sufficient area to reduce ground pressure to less than
100 psi. Provisions shall be made for stowing the pads in the toolbox. The stabilizing jacks shall
fold and be secured for travel. The two front stabilizing jacks shall also serve as landing gear
and support the front of the crusher when there is nothing under the upper fifth wheel. The
stabilizing jacks shall be located so as to stabilize the crusher when the crusher frame is level,
dolly is installed under upper fifth wheel, and all wheels are blocked up clear of the ground.
Two 20-ton hydraulic jacks shall be furnished to raise and lower the crusher as required for
coupling and uncoupling the dolly or truck-tractor. The hydraulic jacks shall conform to
GGG-J-51, Type VII, Class 2, Style B. The hydraulic jacks shall be stored in the toolbox. When
specified, the jacks will be furnished to the contractor by the Government.