I also have an interior illumination problem. I noticed another one from a couple days ago, but mine is different. I have searched and found some great information but the problem persists and now I'm getting frustrated. The car is a:
1998 Contour SVT
77,000 miles
No electrical mods except Ford Racing 9mm plug wires.
About 1 month ago on my way to the Detroit Auto Show I lost my gauge illumination and later found out that my tailights and parking lights did not work. Headlights (low and high), foglights, turn signals (all 4 corners), brake lights, hazzards, stereo, clock, footwells, dome, warning chime, and indicators (PB light, CEL, etc.) within the IP all worked. I checked all related fuses and nothing. So I consulted CEG and found some very similar problems posted a while back. What I found was a problem with the headlight switch. Tony had posted that there was in fact a recall on 1998's for this problem. Once I found this out I immediately went to the dealer and they notified me that the recall does not apply to my specific vehicle, Fordvehilces.com said the samething. My next step was to buy a new headlight switch which was $140 at my local parts store. I then decided that I was going to a scrapyard to find a used one for cheap. Found a used headlight switch installed it everything was fixed and back to normal. Life was great.
Two weeks later I am leaving my house, I go to turn on my headlights and suddenly no gauge illumination, tailights or parking lights. Same symptoms as before. So I am looking for a cure/advice/opinions from CEG before I spend anymore money. Does anyone think that it being a used switch would have anything to do with this (it did work just fine for 2 weeks)? Is there a chance that there is a bad ground somewhere or possibly a short? I am by no means an electrican of any sort that is why I am asking before I go diving deep into the electrics of my vehicle.
Thanks in advance for everyone's help.