06 Cadillac DTS
My driver headlight would flash once or twice & go out. Sometimes after 10 min. or 2 hours. I replaced the bulb less than a year ago. I told my garage that it probably needed a ballast. When I picked up the car I was told the ballast was part of the bulb & They put a new bulb in. Where they right? I've read a lot here about changing ballast.