- Boat trailer lights receive power from the trailer; which receives power from your car or truck's lighting circuitry. Vehicles with towing options are pre-wired for boat trailers, but trailer wiring kits are available for vehicles without the option. The wire connectors that join the circuits of your trailer and vehicle come in various types--ranging from four through nine wires that control trailer components.
- Boat lights are composed of a bulb surrounded by a protective lens. The airtight lens protects the bulb from water--the trailer may travel through puddles or rain, or may be submerged in water. The two major bulb types are LED, or light emitting diode, and incandescent. LED lights are the preferred of the two, using only 10 percent of the power that an incandescent bulb would consume. The brown wire supplies power to the tail lights, license plate light and side lights. The white cable is the ground wire.
- The blinker lights are controlled by a separate wire than the tail lights. The blinker lights use the green wire to signal a right turn and the yellow wire to signal a left. A small signal flasher is embedded in the turn signal near your steering wheel. When the signal is engaged to the "left" position, the signal flasher causes the power to the left turn light to turn off and on and the "right" position controls the right light--creating the blinking effect.
