Reddit reviews ESUPPORT Car Red Cover Red LED Light Rokcer Toggle Switch SPST ON Off Pack of 5

my idea would be to just drill some holes into the existing plastic-covers and install something like this or this

chances of getting a oem Kia switch/button will be hard, since the switches will be sold as spare parts, thus already labeled.

1. Nope, it is mounted through a couple custom brackets I made out of 90° aluminum stock that mount to 2 of the bolts that hold the bumper on.
   
2. I didn't run a relay. You can run a relay if you want, you will just needed a switched source (radio, cigarette lighter, etc.) to reference to turn the relay on when the car is on. That will keep you from accidentally draining the battery. I wanted to be able to run mine with the car off since I use it camping sometimes so I didn't go this route, just a fused connection. I did actually order a wiring kit for the switch and fuse which was plenty heavy (kit came 12 gauge copper stranded with the inline fuse holder and connectors and didn't draw more than 5 amps @ 12V, again just a random Amazon seller). I did source my own switch as I wanted one with the little plastic cover like this. I wouldn't bother with that again though. You can get inline blade fuse holders at most auto parts stores and the connectors at any hardware store. When I was looking at light bars, most on Amazon didn't come with the wiring hardware included so just pay attention to that.
   
3. Only other thought would be look into your local laws. I have never heard of a state where they are 100% illegal, but most states have rules for how you can mount them and such (min and max height, number, down road visibility, etc.). The safest bet is that if an officer asks, it is for off highway use only.

1.

Which wires specifically? In general, I was planning on going for heat-shrink solder terminal connectors and crimp connectors.

One of the reasons I posted this is because there are quite a few connectors and I am still not entirely 100% sure what I need. Obviously when screwing something in to a screw terminal block, the ring crimp connectors. But when joining wires, I would prefer to use the heat-shrink-solder type, but there are also butts and blades (heh).

I bought this set of terminals, figured I'd need them anyways: Assorted crimp terminals

I am probably going to buy this set of solder terminals: Fancy solder terminals

I am pretty good at soldering (though usually circuit boards, not automotive wires, hence not entirely knowing what to do.) I have easy access to a heat gun as well.

2.

Well, both - the breaker goes on the battery, and it sets the maximum amperage for the entire new fuse block and everything attached to it. The fuses go for each individual circuit. I want to use just one fuse for each circuit, instead of having several different circuits sitting on the same fuse, largely for my own desire for neatness and debug-ability. I could have one main fuse instead of the main breaker, but I figure that they will serve the same function and I may as well go for the re-usable option.

I was going to go for this breaker: Fat breaker

That said, I bought this fuse kit, which includes up to a 35A fuse, which will be more than enough. I also bought this fuse holder, in case I decide to use one main fuse instead of one main breaker. (I figured I'd need both of these anyways for some project, may as well get them even if I don't use them right now.)

Fuse Kit

In-line Fuse Holder

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In general, I think my system will basically look like this:

Battery 12V + Breaker = safe 12V

Save 12V + ignition 12V (do I need a fuse here?) + Relay = ignition-switched 12V

Ignition-hot 12V + Fuse Block + ATC/ATO Fuses = eight fused circuits

Fused circuits, obviously, feeding from above. I will probably add a 20A switch in line with high-power circuits, just in case, as an emergency switch.

Fused circuits will terminate at something like this Ground Bar.

 

What do you think of this proposed setup?

I do realize that it's kind of overkill for what I want.

But you can probably agree that overkill is better than your car burning down!