Have a Car Question? Ask a Mechanic Online.
You can go to the brake light switch and hook the wire for the trailer as well.Under dash, look up and above brake pedal you will see a switch connected to brake pedal bar above the pedal. Get a test light and check each of the two wires; and the one that does not light up the test light is the one you need to hook into. Key on when doing this test. Now when you press the brake pedal the trailer lights will come on.If I have not understood the question please elaborate more, so I can understand your need.If I helped you, Thank you for using justanswer.comLeon