I love these tail lights, but, now after almost 60 days or less, left light is Intermittently flickering until now it is just off, no light !! They fit so good, look good, nothing bad to say about them. Hopefully The maker of this product will back up what they build......sell, whichever. I better look at things closer to make sure it's not my 16 year old truck before I totally blame the light. However, the right tail light works perfect in every way. 4-5-2017 Well, good news for me. I was taking the taillight back off and it started flickering. I then believed I was very close to the problem and began wiggling all the plugs and wires. When I wiggled the wire that is soldered to the resister made the whole tail light flicker on and off, I pulled back the heat shrink where it felt weak and sure enough the solder didn't take to the wire, only the resister. Whoever soldered it didn't tin the wire first, and then heat the wire to the resister, tin it, and mate them correctly. And, now they work perfectly. It is amazing what that one loose wire was doing to my trucks computer, codes and flashing and flicker......Oh my gosh!! Anyway, things happen. My lights have all settled down, they don't quick flash or flicker finally, and somehow it seems the truck even runs better now. Seemingly, the computer can now adjust to the new parts(cool air intake, and PPM turbo valve) And seems to run better all around. I'm noticing the transmission is carrying longer especially when it comes to the converter locking in and out. This is very helpful when towing heavy. Or, just feeling the trucks muscle for grins !! OOOH !! I contacted the business they shipped from and they have not returned my request to talk to them about what was going on. Shame On You !! You sure got back to me when purchasing them.... Thanks, I will keep that in mind.