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it's not a ballast problem. your high beam solenoid might be stuck, or a bad fuse. there is no separate bulb or voltage for high beams. once you turn on the high beams, it actuates a solenoid inside the projector that lowers a cut-off plate, revealing the entire output of your bulb. low beams have that cut-off plate up, blocking half of the output of the bulb (hence why there is the flat cut-off)
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