Bought 2 sets of these LED's for a car that has a 6V positive ground system.1 pair worked well however the other pair did not.Checked them with a battery and found that 1 pair was polarity sensitive and only worked with a neg.ground. That pair came in a slightly larger box. Don't know why the same part number would differ.So be careful. Some of these on revain do state they are non- polarity.
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