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circuit breaker that will protect the motor from overcrank heat damage. The circuit breaker shall
not limit cranking ability for a startable engine.
* 3.4.2.2 Ignition system. For gasoline engine driven vehicles, a 12-volt dc ignition system
shall be furnished.
* 3.4.2.3 Alternator. Unless otherwise specified (see 6.2), a minimum 85-ampere alternator
shall be furnished. The alternator output with the engine at idle speed shall be not less than
45 amperes.
* 3.4.2.4 Lighting. All vehicle lights, reflectors, and wiring shall conform to Federal Motor
Carrier Safety Regulations 393.12, 393.13, 393.19, 393.20 and 393.22 through 393.26(d). Lights
and reflectors shall not be mounted on vertical surface of rub rails or mounted on vehicle bumpers
(unless recessed and fully protected). Positioning and guarding shall permit normal replacement
of the bulbs and lenses. When right-hand drive is specified by acquisition documents, left dip
headlights shall be provided. Left-dip headlights may be provided as a replacement set, stowed in
the cab for shipment.
3.4.2.5 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. On class 10
vehicles, front turn signal lights may be integral with parking lights. Turn signal units shall be
installed in accordance with SAE J588. Turn signal operating units shall have a visible flash
indicator.
3.4.2.6 Batteries. Each battery shall be of 12-volt potential. The total reserve capacity
ratings and the total cold cranking ratings at -18C (0F), both measured in accordance with
SAE J537, shall be not less than specified in table VIII for the indicated engine type. The
batteries shall be of the maintenance-free type having the maintenance-free characteristics listed in
W-B-131.
Table VIII Batteries.
Engine type
Reserve capacity
Cold cranking
(minutes)
(amperes)
100
450
Gasoline
180
1,080
* Diesel (class 10 wrecker only)
Diesel engine,
200 kilowatts (kW) gross
(270 gross horsepower) or less
480
1,875
Diesel engine
(over 201 kW gross (271 gross
640
2,500
horsepower
17
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