I just installed e36 zkw headlights w/ angel eyes. It was working fine for the first 2 weeks. Then, suddenly the angel eye on the driver side stop working. First, I thougth I have an burnt out ballast. I took the ballast on the passenger side and tested it on the driver side; still not working. Then, I use my old Depo angel eye ring to test on the driver side; still no luck. But when I tested on the passenger side, it works. There must be something wrong on the driver side that I can't diagnose the problem. The lighting sponsor suggested that I recheck all the possible problem to verify what part that failed. I did the best of my knowledge. please help!