Not really sure where I should post this but...

So I'm figuring out how I'm gonna wire up all my winterization stuff and figured out a method. I've never really worked with house electricty aside from simple, simple projects.

Anyways, I'm going to run a battery tender, block heater, oil pan heater, and trans pan heater. I need one cord coming out of the truck (I'm actually going to be wiring in a Marinco socket to my bumper to clean up the install) and have been at a loss as to how to cleanly run 4 wires into one without a jumbled mess under there. I also want the ability to run the battery tender year round without having the other stuff running. Here's what I'm figuring now but I'm not really sure if this is the proper way to switch 3-wire power.

I'm also open to any other suggestions!

 

Disregard, I figured it out.