Just finished wiring a 40" light bar in my Raptor using this tutorial. Great Job on the pictures! I was surprised to see how accessible the wires were and easy to find. Now Soldering under the dash was not real easy but manageable.
A couple of things to add. You DO NOT have to use the Ford's recommended wiring connection from the switches to the wires under the hood. My light bar needs to be fused for 15 amps so I connected the Aux 1 (yellow) to the 15 Amp fused wire (blue) so I could still use the Aux 1 switch. I also connected the Aux 2 to the 10 amp wire for my next light bar.
One more thing to add you should only be soldering your connections, if you don't know how, search youtube for a how to video.
Here is the website I used to reference the wires for the Aux switches and the fuse ratings under the hood. I have a 2013 Raptor and the wiring colors were correct.
Instructions for Ford Raptor upfitter switches
The under hood or "pass through" wires are all the same gauge and do not directly correspond to any of the aux switch wires. In other words there is no specific amp rating for them.