I have been messing around with my dome lights trying to get some new ones. I just went to snap in some new festoons in the rear and I saw a small spark. The lights have not gone on since and I originally got 2.6V across the contacts, then .6V the next time I checked it. My dome light is out now too. I cannot find a fuse for the interior. Is it tied to other fuses like the cig lighter or something? But I am afraid that might not be the problem anyway, (unless there is a third fuse box I have not found). I checked all the fuses and they are all OK.