This happened to me and is now fixed. My problem was my passenger side either would not come on or would need a flick to the 12v relay case (balck box with a silver screw eyelet thing on top usually wrapped in heat shrink), problem got worse with it coming back on without a flick to the relay the hotter they got. The next time it will not come on try flicking or hitting the 12v relay on that side. If it comes on try to make the connections smaller to increase contact make sure to unplug battery before doing so. This was only a temporary fix for me as it only worked for a few months, then came back, so I ended up getting a new wiring harness with the relay from Tone (for free Tone stands behind his prducts thanks again) and have never had a problem again. Hope this helps and I have a feeling it is not your bulbs but that stupid relay thing like mine, sounds exactly the same as what I went through. In Christ, Ryan