What fuse can I tap into that would give me power when I turn truck off but the radio and everything still stays on. I tried nearly all of them in the fuse block under the dash and couldn't find it. Anyone know?

I pulled the stock head unit and used a test light to identify the wire that I needed to use for the Remote turn on wire. One wire is hot all of the time and the other is only hot when the key is in accessory or on position, thats the one you want. Just splice them together and you're set.

Right now I have my wire running to a fuse that turns it on when the key is in accessory or the on position, but I'm wanting it stay on when my truck is off and key is off, then shuts off when you open the doors. Like it does when its stock.

mine is wired the way I previously mentioned and operates same as stock.

You're looking for Retained Accessory Power. It's a pain, but if you want to do it instructions are at http://dieselplace.com/forum/showthread.php?t=40224