Sorry to start a new thread on a topic that is practically discussed all the time but couldn't find any info when I searched through. Right basically I bought some LED rear lights off eBay. They have massive heatsinks! I fitted the first one with no problems at all. I then moved onto the second one and it didn't work. I decided to put the factory bulb back in and also that did not work. So I was running with just one working. I then thought about swapping the lights over, so I put the LED which was working into the side that wasn't...still no luck, so I put that back into the side it was working and now it doesn't work. Neither do both of the original lights. Could anyone shed some light on this problem. Any alternative LED light that works with no problems. Or how to get my original lights working. My a3 is 2005 sb model by the way!