Hello, when I turn my headlights on my dash lights up but part of it is really dim. It has been like that for like 7 years. The other night however the lights kept dimming back and forth like they were going out. It has not did it in a while. One instance was when I was driving they were bright but when I stopped they went dim and a few seconds later they went bright again. The battery gauge does not move and the explorer runs fine. Any ideas on the problem?