They are very poorly assembled. As they were designed and built, the positive wire is under the grounded part. So you will be shorting out the wiring as the sharp metal edges will cut through the wire's insulation. All four lamps I bought were defective in the same way. If you only need the light to work today, then that's fine. If you want them to work next year, don't buy them. Trailer wiring short-circuit guaranteed.
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