I recently made a roadtrip from PA to GA, and just as I was approaching 1000 miles, I noticed a faint smell coming from the vents (smelled like sulfur, or something burning). I pulled over, shut the car off and gasses up, and when I turned it back on, the low beams, blinkers, horn, heat/AC, wipers, and thermostat (there may be more that I just haven't noticed yet) did not work. My mechanic thinks it may be the ignition switch. Do you think that is the problem, or is is more likey a more serious problem? Thanks much.