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OK, let's start over. We need make, model, year and engine size.
You need to test for 3 things
Reply back when you have all of that and we should be able to tell you something.
Your saying the engine cranks but no lights on the dashboard?
Does it have injecter pulse?What is the fuel pressure?
What kind of truck is this?
Make, model, year and engine size.
Well, the one thing that might be able to cause all that would be the ASD (Automatic shutdown )relay. You should be able to locate that under the hood. Here's the wiring schematic. You can follow that to troubleshoot what power sources you do and don't have at places like the fuel pump relay.