I would suggest trying to pull out the bulb, rotate it, and put it back in. I have found that this addresses the issue as apparently they are specific on which/where the contacts meet the socket as there is some sort of polarity. Also, check out www.superbrightleds.com if you are looking for a car specific LED blinker module. I have dealt with them for 10+ years and they make a great product. ALL of their bulbs have lifetime warranties and their site is extremely helpful. Hope this helps!