MIL-S-46777 Semitrailers, Dump, Commercial, General Specification ForThis specification covers various sizes of rear dump semitrailers. The dump semitrailers are operated by the truck-tractors hydraulic system, unless the self-contained engine driven hydraulic option is required.

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MIL-S-46777C

Military-Commercial Connections

Function

Mil. Receptacle

Terminal

(Circuit No.)

Connection

Instructions

Comm. TTMA

Wiring Ident

Blackout Marker

Ser. Left Turn & Stop Blackout Marker Ground

Ser. Tail & Marker

Blackout Stop

Blackout Marker

Ser. Right Turn & Stop

Aux. Power (Hot) Ground

Electric Brake

B (22 - 461) C

D (90)

E (21 - 489)

F H

J (22 - 460)

K (37) L (90) M

None. Connect to -

None.

Connect to - Connect to -

& Connect to - None.

None. Connect to -

None

Ground to Frame

None.

YEL (3) WHT (1)

BLK (2) BRN (6)

GRN (5) BLU (7)

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 (461) and J (460) 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 truck's 24-volt system input.

3.11 Fungus and moisture resistance. The electrical circuitry of all electrical systems, including all components and connections except as specified below, shall be protected from the effects of moisture and fungus growth by an overall treatment with commercial electrical varnish:

(a) Components or circuit elements which are inherently fungus and moisture resistant or which are hermetically sealed need not be treated.

(b) Components or circuit elements whose functions will be adversely affected by the

varnish coating shall not be treated.

When used, the varnish shall be applied by spray, brush, or a combination of both to give a minimum dry-film thickness of 1 mil to component or element surfaces previously cleaned and prepared so that the surfaces are free from all foreign matter which would interfere with the adherence or function of the varnish.