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|  MIL-T-46705E
be not less than 910 mm (3 feet) longer than the distance from the trailer receptacle to the
lunette. Provisions shall be made for securing the cable, when not in use, to the drawbar or
trailer body.
3.13.3 Brake wiring. Electric brake shall be wired to the auxiliary circuit of the SAE J560
seven-conductor electrical receptacle. All wiring shall be properly mounted and secured with
clamps. Brake wiring shall be heavy thermoplastic insulated cable and shall be enclosed in
conduit.
* 3.13.4 Breakaway battery wiring. When electric brakes are furnished, a 12 volt battery shall
be installed to operate the electric brakes in the event of a breakaway from the towing vehicle.
The battery shall be maintenance-free type having the maintenance-free characteristics listed in
W-B-131. The reserve capacity rating measured in accordance with SAE J537 shall be not less
than 35 minutes. The cold cranking rating at minus 18 degrees Celsius (oC) (0 degrees
Fahrenheit) (oF) measured in accordance with SAE J537 shall be not less than 160 amperes. A
weatherproof battery box shall be furnished. A battery recharging circuit shall be wired through
the first pin of the four-conductor electrical receptacle specified in 3.13.5. The second pin shall
be return ground to the towing vehicle. A diode shall be installed in the system so that the
electric current will not flow from the trailer battery to the towing vehicle system.
* 3.13.5 Breakaway battery wiring. The breakaway battery shall be wired to two conductors
of a four-conductor electrical receptacle, Midland Model 23400 or equal. A second identical
receptacle for mounting on a towing vehicle shall be furnished. The receptacles shall be
polarized and weather-proof. A connecting cable, each end equipped with a mating plug,
Midland Model 23403 or equal, shall be furnished. The cable shall be not less than 910 mm
(3 feet) longer than the distance from the four-conductor receptacle to the lunette.
* 3.14 Rear end protection. Rear end protection in accordance with Federal Motor Carrier
Safety Regulation 393.86 shall be furnished. Rear bumper or bumperettes shall be furnished on
type II trailer.
* 3.15 Rear wheel splash and stone throw protection. Mud flaps shall be provided to the rear
of the wheels in accordance with SAE J682. A metal strip of not less than 3.2 mm (0.125 inch)
thick and a not less than 25 mm (one inch) wide, extending the entire width of the mud flap, shall
be used as a baking to prevent bolt head or bolt nut from damaging the mud flap. As an alternate
method of attaching the mud flaps, tabs or clips with minimum surface contact dimensions of
25 mm (1 inch) high by 32 mm (1.25 inch) wide by 2.4 mm ( 0.094 inch) thick shall be furnished
at each bolt.
* 3.16 Platform, class A. The platform shall be a rectangular level surface, free from kick-up
or wheelhousings. The flooring shall be tongue and groove or ship-lapped hardwood,
conforming to 3.1.1.7 and 3.1.1.8, having a thickness of not less than 25 mm (1 inch).
12
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