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|  MIL-T-62320C
3.4.2.2 Ignition system. For gasoline engine driven vehicles, an ignition system of 12-volt
dc potential shall be furnished. An alternator of not less than a 40-ampere rated capacity and
which provides not less than 16 amperes dc output at normal engine idle speed shall be
furnished. When a converter type 24-volt system is provided for a trailer receptacle (see 3.4.2.6),
an alternator of not less than 60-ampere rated capacity and which provides not less than
16 amperes dc output at normal engine idle speed shall be furnished.
* 3.4.2.3 Lighting. All vehicle lights, reflectors, and wiring shall conform to Federal Motor
Carrier Safety Regulations 393.12, 393.19, 393.20 and 393.22 through 393.26(d). Lights and
reflectors shall not be mounted on the vertical surface of rub rails (unless recessed and fully
protected) or mounted on vehicle bumpers.
* 3.4.2.4 Turn signals. Turn signal lamps shall conform to SAE J588. Operating units shall
conform to SAE J589, class A, and shall be mounted on the steering column. Turn signal units
shall be installed in accordance with SAE J588. Turn signal operating units shall have a visible
and audible type flash indicator.
3.4.2.5 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
rating and the total cold cranking rating at 0OF, both measured in accordance with SAE J537,
shall be not less than that specified in table II. Batteries shall be of the maintenance-free type
having the maintenance-free characteristics listed in W-B-131.
TABLE II. Batteries
Engine type
Reserve capacity
Cold cranking
(minutes)
(amperes)
Diesel
320
1,200
Gasoline
100
450
3.4.2.6 Auxiliary 24-volt system with trailer receptacle. When specified (see 6.2) , an
auxiliary 24-volt system with a trailer receptacle assembly shall be furnished. Either a converter
type (see 3.4.2.6.1) or an alternator type (see 3.4.2.6.2) system meeting specified requirements
shall be furnished. A trailer receptacle, conforming to MS75021-2 with cover assembly, shall be
provided in an accessible location at the rear end of the vehicle. A twelve-conductor truck
tractor lighting cable not less than 110 inches long, with both ends of the cable equipped with
connectors conforming to MS76021-1 and MS76020-2, shall be furnished. The cable assembly
shall be stowed in the vehicle. The 24-volt service lighting circuit shall be connected through the
appropriate lighting controls to terminals B, D, E, J, and L of MS75021-2.
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