interference froma ballast maybe? they are 23,000volts.....
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Yes, that's my guess, interference from the ballast. Im not sure why it only happens to certain vehicles. I have had 2 clients so far with aftermarket ballast with the same problem and we tried everything to stop it with no luck. TRS told me that a higher quality ballast like Denso put of less interference because it was better insulated.
This is the first time Ive heard of it on OEM HID's.