k cool ,I ordered a pair off ebay(52.00can)went with the factory 4300 though(I don`t like change). they look straight forward to do.
I didn`t know if a ballast would cause this issue or not, I suspect with a ballast if it went there would be no power going to the hid at all.
I went to part source and they wanted 100.00can for just 1.

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2003 bmw x5 3.0i ,219000km build date 2003-08-18