How To Wire Up Trailer Lights On A Truck. To legally tow a trailer, vehicles must be wired for trailer lights. Wiring trailer lights is not as difficult as most anticipate.
Troubleshooting Trailer Lights by Alan Glos (Excerpted from Messing Around In Boats) (click Rig "C" is a removable light board consisting of all the fixtures and full wiring mounted on a plank that that makes it relatively simple to hook up the rest of the rig). By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights. Also it helps to run an extra wire from the trailer to the truck frame.
Make sure the housings are waterproof for any trailer that will be immersed, but also know that "waterproof" is still no guarantee of a long life.
To legally tow a trailer, vehicles must be wired for trailer lights.
Most commonly, trailer harnesses have four wires. Are the yellow and green the left and right turn signals and the brown brakes? As for the wiring diagrams, here is a couple different versions to go with.
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