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Good advice. I'll dig into that next

That's possible, but it's only ever happened when the wait light didn't come on. If the wait light comes on, I always get the voltmeter bounce after starting and when the preheating cycle is over it goes to green. I'm hoping it's not a sign that my control box is going...

I'm leaving it on RUN for 60 seconds before starting. It's not that the glow plugs don't need to come on for the vehicle to run, it's that they system doesn't need to preheat them. So the wait light never comes on. My assumption is that the control box "knows" that the engine is already warm...

A few days ago it was warm enough out that when I went to start my HMMWV the wait light didn't come on. I waited about 60 seconds and then started the engine The voltage gauge went into the yellow and stayed there. Usually it bounces between yellow and green for 60-90 seconds as the system runs...