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you need to start eliminating possiblities. Take your known good bulb and try that, take the other bulb and put in known good ballast and side.
If the bulb doesnt work on the bad side and did on the good side, and vice versa then move onto the ballasts and flip them. As you eliminate problems you are closer to the answer. It also helps you keep from buying stuff that is not needed.
If both ballasts and bulbs are good then you have an issue in your electrical system. check fuses and relays.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.