I have owned several LED replacement bulbs (3157,1157 etc.) and All that I have owned have blinked fast (was too lazy to install the resistor). But anyways, I have had a problem with all of them. I usually get the ones with 19 led's. I have four on my subaru. 3 of them just recently have 3 bulbs out around the center. On each bulb, its the same three that are out. They are connected like a crescent. Is the fast blinking wearing them out??? OR is there another problem.
Scooby