Chances are, if it's not working, flip it. These have a pos/neg connection which I find odd but they work amazing and for a good price.
BRISHINE 300LM Canbus Error Free T10 LED Bulbs - Pack Of 4 Extremely Bright 194 168 2825 W5W, 6000K Xenon White, 9-SMD 2835 LED Chipsets For Dome, Map, Door, Courtesy, And License Plate Lights
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38 Review