Expert Answers about Hyundai Sonata

• Trailer Brake Lights Do Not Work After Installing Curt Trailer Wiring Harness # 56049
• It sounds like a bad ground connection. What you will do is disconnect the trailer from the vehicle. Then make sure the ground for the wiring harness # C56049 is attached to a clean and corrosion free bare metal surface. Use a circuit tester like # PTW2993 if you do not already have one to test the pins on the 4-Way while someone sits in the vehicle and goes through all the lighting functions. If the brake lights/turn signals still do not work use hte circuit tester to test the wires going...
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• Trailer Brake Lights Go Out When Brakes Are Applied on a Trailer Towed by 2009 Hyundai Sonata
• You will want to look at the grounds and wiring for the lights themselves. This sounds like a ground or short circuit issue. Trailer lights ground through the mounting studs unless there is an obvious ground wire. In either case the grounds need to be attached to clean and corrosion free bare metal surfaces. When you inspect the wiring, look for any nicks with exposed wire that could be touching the metal trailer frame. This would cause a short. I have included a link to our wiring FAQ...
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• Trailer Brake Lights Not Working with Curt Wiring Harness Installed on 2009 Hyundai Sonata
• It could still be a ground problem. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light but can show up any time. Since the brake lights draw more constant power than any of the other functions it makes sense that a ground problem would show up when using the brakes. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside...
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