I recently purchased a 2007 sierra and it has auto headlights. My instrument lights are dim a lot. occasionally they brighten to normal. I am referring to day time. I know when the headlights turn on they dim. Mine stay dim 50% of the time.The sensor is not covered but is behind my state inspection sticker. Is that enough to cause dim instrument and radio lights? any help or suggestions would be appreciated. Its a 1 owner with only 14000 miles. vin is 1gtek190477569240. May be 7z5 instead of 775http://gmcowners.com/gmc-forum/images/smilies/frown.gif
