These lights are sealed so there are no moisture issues. The wiring is of very small cross-section and if not secured vibration problems can occur. Some people may have difficulty connecting wires to the larger gauge wires commonly used in cars, trucks, and trailers. I haven't had any issues with the connectors since I use a crimping tool. Electrically these lights are the best of 4 sets (manufactured by different suppliers, 3 of which were either mechanically or electrically unsatisfactory) recently purchased.
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