Won't start below 40 degrees, wait to start light does not even come on
Your glow plug controller is out, or there is an interruption in its power source, etc. Diesels are coldblooded by nature, and most need glow plugs to heat them up before starting in cold weather. The controller supplies the power to the glow plugs, but if it goes bad, or its supply of power isn't there, it won't start in cold weather, and that wait to start light which is also controlled by it won't come on.
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