I only had LEDs one day, but I wanted to help people. The center is positive and the body is grounded. Turns out my car had the polarity reversed, so I opened up the LED and swapped the wires inside. The LED went to the installation and immediately lit up. So if your lightbulbs aren't working, chances are that's your problem. It also turned out that white LEDs can be made blue by removing the yellow plastic on top. Below is a photo of the LED with the plastic removed.
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