Side marker lights provide additional illumination during nighttime and poor visibility to help other drivers and pedestrians see the vehicle. Side marker lights are standard equipment for buses, trailers, cars, trucks and certain work and utility vehicles.

Side markings typically consist of a single element bulb or a carbon fiber (thermal) bulb or LED (light-emitting diode) bulb housed in a socket and small frame.

The sidelight has a single wire, usually a 16 gauge, from the light bulb socket to the parking light, the tail light or the main headlight weaving machine. They operate from a standard 12-volt automotive power supply and are activated when the headlights are turned on.

The sidelights function very similarly to the parking lights, but they are mounted on the side of the vehicle. They are located in front of the front wheel or behind the rear wheel on the side of the body. Depending on the type of vehicle, the sidelight can be mounted on the bumper, fender or rear quarter panel. They are sometimes illuminated with headlights, sometimes with directional lights, and sometimes both.

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