Wire it up to a cigarette plug and use the power plug on the dash, it's ignition active only. There's also a kit that taps the same cigarette plug on the dash and allows more to be used on that circuit.
Personally, I would just wire it direct and not worry about it. It's pretty hard to forget the CB is on as most use volume for the on/off switch too. Doing it this way also keeps electronic interference at a minimum.
2013 JKU Sport, billet, auto, 3.73, LSD, 315/75/16 Duratracs on MB 72, 10A springs, Bushwacker flatties
Never ever ever hook a CB up to anything but the battery if you're at all concerned about performance of the CB. For positive anyway. You can ground it directly to the factory ground points or could make your own. If you mount it to metal you can just ground it to one of the bolts for the mount...as long as you make sure that piece of metal is grounded GOOD. It better have a wire from it to the frame if its "good".
Basically, you'll get more radio frequency interference and less power from hooking the positive up to pretty much anything else. You won't notice it, but you'll have more noise and have to turn the squelch up, and because of that you'll miss weaker transmissions and lose a LOT of range. you wont notice it until you hook it up right.
CBs dont use much power to receive and you could leave it on for hours with no ill effect....someone will ask why the car is talking eventually.
Good points about interference. Where's the factory ground in the drivers foot well?
Also, what's the best way to get through the firewall to the battery for power?
I have a 2012 with automatic and AC. Who knows if that makes a difference. There are 2 ground points right near the door hook for the limiting strap. Use one of those. Don't drill something new.
Use a coat hangar, tape wire to it and poke through from the engine bay. My 2012 the access hole is on the driver side. The wire feeds down when pushing it through from the engine bay. You will see the wire near the floor if you push enough through.
In a 2013 with manual transmission and AC the access hole is on the passenger side. I wired up my brother's Jeep and was dumbfounded it was not on the driver side like I was used to. Easy to find though.
If you find it easy ground it all the way back to the battery, but you should not have to.
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000
S Package/Auto/Dual Top
Custom Stereo/20% Tint