Figure 4-6.—Typical sealed beam headlight assembly.lights that outlines the height of the vehicle. Somevehicles have a separate switch for the clearance lights.When you are operating a vehicle at night with clearancelights, do not forget to turn them on.Side Marker LightsSide marker lights are similar to clearance lights;however; they indicate the full-overall length of thevehicle as viewed from the side. They must also bevisible from a minimum distance of 500 feet from thevehicle. Side marker lights, mounted near the front ofthe vehicle, are also amber and those near the rear arered.ReflectorsReflectors (except for those used in the lights) areused as an additional safety precaution in case lightsburn out or are broken. When mounting reflectors,ensure they are between 24 to 42 inches above theground.Taillights and Brake LightsAll taillights must show red and be visible from atleast 500 feet from the rear of the vehicle. The taillightlens should be replaced if it is not red or contains a dotof another color or if it is cracked, broken, or does notfit tightly. A brake light is usually combined with thetaillight by using a double-contact, double-filamentbulb; however, it maybe a separate light. Stop lightsmust light up immediately when the brake pedal isdepressed; that is, at the beginning of the downwardaction of the brake pedal. Brake lights are asafety-required item and they must be operational at alltimes. Burnt-out or weak lights should be documentedand repaired before operating your vehicle or piece ofequipment.Auxiliary LightsLights that can be turned on or off for theconvenience or safety of the driver or passengers arecalled auxiliary lights. These lights are wired to beturned on and off independently, and not with theheadlights. When performing your prestart operation,you should ensure all auxiliary lights work.SPOTLIGHTS.— Spotlights are often mounted onconstruction equipment and weight-handlingequipment. When conducting prestart operations,always make sure the spot-lights work because younever know when you will encounter conditions orsituations requiring their use.BACKUP LIGHTS.— Backup lights areaccessories for many vehicles. They may be mountedsingly or as a pair, one on each side. Backup lightslenses must be colorless and must turnoff automaticallywhen the vehicle is moving forward. Backup lights mayalso be connected to a audible signal. A backup lightmust be aimed to strike the road at a distance that doesnot exceed 25 feet from the rear of the vehicle.PARKING LIGHTS.— Parking lights have amberor white lenses and are located on the front of thevehicle. They turn on and off with the same switch asthe taillights.FusesFuses are safety devices placed in electrical circuitsto protect wires and electrical units from a heavy flowof current. Each circuit, or at least each individual4-5
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