I have replaced the battery, new alternator, new terminals. I definitely can not leave anything plugged up when I turn it off or within 15 minutes the battery is completely dead and won't even turn over. I think that there is something drawing power constantly but I'm not sure what it is or how to check and see if there is. Any Feedback would be great thanks for your time.

 

search eric the car guy on you tube. his site has a video on how to perform a parasitic draw test.

make sure all aftermarket items are unplugged or disconnected from the truck.

 

That would be a HUGE draw !!! However, that should make it tons easier to diagnose.
Please post battery voltage across the battery terminals WHILE the engine is running like 2500 rpm. Do NOT disconnect a battery cable while the engine is running, bad.

Right now we're assuming that you had this issue and that's why you replaced battery, alternator, new terminals.