this may sound odd but check the screw in the bottom of the fusebox. I had the exact same thing happen on my old one, damn near drove me crazy until i happened to come accross the problem in the midst of running new wiring. Simply tightened down the screw and viola. Good luck

__________________
83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.