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Old 01-21-2016
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Yes, LED = light emitting diode
A diode only allows DC voltage to flow in one direction, so is, by it very nature, polarity sensitive.

They can add regular diodes so + is sent to + side of LED and - to - side of LED, no matter how the power is applied, this of course adds to the cost of the LED, but not alot.
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Old 01-21-2016
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could have been bad led's or bad connection in the bulb socket or on the cluster back.

led's are polarized +/- but some have been made with a diode bridge that lets them work either direction. i prefer to check polarity & make sure things are installed correctly.
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