My HID ballasts are mounted directly to the frame of the car and I have not had a single issue.
So just out of curiosity... question for you guys, especially for Clyde, were you guys mounting OEM or aftermarket ballasts? Theoretically this could be something to do with the ballast itself... e.g. maybe the OEM ones have grounded cases to prevent EMI leakage. Just a thought.I've mounted the many ballasts right next to the sensor on my friends cars, and maybe only 2 out of 10 have the same problem, the other 8 are fine. It could also be how the ballasts are designed, whether they are shock proof, etc. Did the same thing, remounted the ballasts and problem is gone.
Your best bet would be taking off the bumper, and mount it on the metal bar. Haven't heard any problems