Double check the ground, always clean the dirt/rust off from the connectors, and make sure there is no pinched wire!
For help with grounding issues, watch this video.
More or likely one of pins of the 4 pin connector (or 7 pin) is compromised. Make sure there is no dirt or rust at the contact point. Insure there is metal to metal contact between the vehicle and the trailer connectors.
Unlike incandescent lights, LED lights are polarity sensitive; they work only one way and + - is not interchangeable. Normally, the ground wire is white, but not all manufacturers follow the same format. If one connection is not working, flip it the connection and the light should now work.
Before making the connection to a vehicle:
1. Test the lights before installation by applying DC 12V (such as power from an automotive battery). Verify all the lights works; be sure to check for correct polarity for LED lighting.
2. Verify vehicle side connector (4 pin or 7 pin) is working properly. Test either using a volt meter or a test bulb. Turn on the tail light and test between the ground and the tail light pin.
3. After confirming the vehicle side connector and the lights are functioning properly, wire the lights to the trailer and plug in the trailer side connector to vehicle side. If lights are still not working, please contact our customer service department.
LED turn lights require a special flasher. The original flasher relies on a lot of current to pass through to work properly. Since LED lights use far less current than incandescent lights, the flasher thinks the bulb has gone bad, so it will flash rapidly.
There are two types of systems; independent and common. If you have a separate bulb for the brake light (Stop) and turn light, then you have an independent system. In that case, you will need a converter to convert it to a common system in order to use the trailer lights.
Yes. Even with submersible trailer lights, there are wire connections that may not waterproof. It's best to unplug the trailer before submerging in water.
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