Ok, so here's what happened. I crank the 94 S350d the other morning to go to the CarQuest for parts for the GMC. Run the preglow, starts right up as always. Get done at CarQuest, run the preglow, it cranks right up as always. Go to put it in reverse (do not think it ever got to reverse) about 30 seconds after start and the car shuts down. I try to restart it and do not get any of the caution (idiot) lights on the instrument panel like normal, nor do I get a glow plug light. When I put the key to start, absolutely nothing. Everything electrical works, lights, turn signals, sunroof, radio, blower, headlights are bright, etc. So it's not an electrical failure related to the battery. All the fuses in both boxes look to be good and swapping them hasn't helped. Even fuse 17. Reckon it's as easy as an ignition switch taking a dump on me?