I have a 2005 chevy duramax. The problem I'm having with it is that it's blowing the headlight and the fog light bulbs too fast.( at least once a month on the headlight and once every three months for the fog lights). A mechanic told me it sounds like that's from over charging, but when I took it to the shop to the alternator guy, he tested the alternator, and said the alternator was fine. I can feel the heat coming from the headlight from standing about one foot or more away from the headlight. Any suggestions would be greatly appreciated!