You will need to check the wiring under the bumper where the trailer wiring is with a test light and with the different lights working.you will probably have to move back in the wiring by 6" and retest until you find were the loss of power is.you don`t say if all the lights don`t work or just certain ones.the brown wire is the tail light,green is the right signal light,yellow is the left signal light and white is the ground wire.you could have broken wires at the trailer hook up itself.
Testimonial: "Tail light working the rest dont, thanks will keep looking"
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