I've noticed that my headlights and dash light will periodically dim. This seems to happen more often when its raining/snowing, but its not limited to wet weather. The truck is only 15 months old, and the dealer can't find anything wrong with it. Any ideas?

 

I have the same problem, not just in cold weather, but noticeable at night due to headlights and interior lights dimming. no one can find a problem??????

 

I had this same problem and was told by the dealer that it was a common problem on this truck because the belt will slip from time to time, expecially when it is wet. I had them tighten up the belt pulleys with a little more tention on it and it seems to have corrected the problem. I hope this answers your questio.