Trailer Light Wire colors

Yellow- left turn signal
Green- right turn signal
Brown - Tail lights
White- Ground

When brakes are applied power is sent to yellow and green.

You may need a taillight converter if you have a non US made truck or car....see below:

CONVERTERS

All foreign vehicles, and several American ones, use an "international" lighting system. This means that the turn-signal lights are separate from the stoplights. If the lights on the rear of the vehicle have an amber lens for turn signals and a red lens for stoplights, you need a converter. The "American" lighting system combines the turn signal and stoplight functions into one wire instead of two.

American boat trailers use the "American" lighting system. Consequently, if the tow vehicle has an "international" system, the two separate wires for turn signals and stoplights, on the tow vehicle, must be combined into one. To do this, a converter is necessary.

A converter is a circuit board built into a small, plastic, waterproof box or built directly into a four-way connector. The one built into the converter is preferred, because it reduces the number of wires needed to activate it, and it is not necessary to have a separate box that needs to be mounted elsewhere. Usually, three or four wires from the tow vehicle left and right turn and brake wires go into the converter and two wires come out. The two wires coming out are connected to the left and right turn connectors in the trailer-plug receptacle.

FLASHERS

Many automotive manufacturers require that the factory turn signal flasher be replaced with a heavy-duty "flasher". The flasher controls how the turn-signal lights "flash". The standard flasher that comes with most vehicles is not designed to operate more than vehicle's lights, so it overloads. This overloading causes the tow vehicle and trailer turn signals to flash rapidly and faintly, so they are hard to see by motorists driving behind you. Changing to a heavy-duty flasher will solve the problem. Be sure you get the right heavy-duty replacement, make sure it is designed for trailering applications. All flashers are calibrated to the amperage required and the number a light bulbs on the circuit.

The flasher is usually located under the dashboard. On most new vehicles, it is connected to the fuse box and simply pulls out. There are usually two flasher modules, one flasher for the turn signals and one for the emergency lights. You should only need to replace the turn signal flasher module, although we recommend testing the emergency flashers as well.

Click here for Instructions to prepare and secure a vessel for overland transportation