If my 99 ford f350 with a 7.3 diesel is not plugged in it will not start under 50 degrees what should I check?
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From your comment, I'd suggest you take a look at the glow plugs and/or the glow plug relay. Here is a YouTube video which should explain how to check the relay:
Here is the link to the Google search I used to find it, which may even provide better results.