I bought a 15' outdoor extension cord to use for all my wiring.
Here I have the strands separated and the Hot lead spliced for constant power to the controller and the feed for the switched power. In the spirit of neatness I have designated the ground in this section to be the switched hot out of the controller. I made sure to clearly identify both ends with red shrink tube.
Here is the controller wiring hooked up.
The wires from the controller and the wall will meet in the outlet box on the back of the collar.
Here you see the wires mocked up for measurement and test fit.
Once I mocked it all up, I drilled the holes in the boxes and ran all the wires to see how it all works together. You can see the temp probe wired up as well.
Now that all the holes are drilled and wires are ran its time to dismantle it all for staining. I will measure and cut the insulation once all the hardware is reinstalled.