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Aftermarket kits are a PITA to troubleshoot. It could be the bulb, ballast, loose/faulty connections. Best way to do this is test things on the side that still works.
I went through similar problems an when I had enough of troubleshooting, I just went OEM an coded the car. Only difference is that I threw in Osram CBI bulbs. Cleaner and easier to maintain.
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