I have a Ford f350 xl 6.0 Diesel and im looking to change out the factory head unit and add a amp and 2 10" subs in the back. Also going to change out two front door speakers with better ones since my passenger speakers currently blown out and im down to one driver door. Could use a wiring diagram for this beast

 

just use the factory plug that is already installed for the front and rear speaker. just unplug the stock radio, and get the wiring harness adapter for your new radio.

as for the amp and subs, you will need to run a power wire straight to your battery (rec 6 guage), a ground wire (ground to mounting frame of seat), and a remote wire, which will be run to the blue wire on your new stereo. Then, run a set of RCA wires from the output of the stereo to the input of the amp (if wanting to use the amp for just your subs, then get a stereo with a sub output).

make sure you run the RCA cables on opposite side of the cab from power wire. you dont want to run them next to each other because may induce "noise" into the system.

my current system has an double-din head unit, pioneer fron and rear speakers running straight off the head unit, and 3 JL Audio 10's running off a JL audio amp, and everything sounds great.