Mine only has 1 and its activity is controlled by the key being off or on. I would like to install another one that is always hot. Must I run new wires from the battery to the plug or is there another access port, so to speak, where can run always hot wires to the plug?
Honestly, your best bet is to run a fresh wire directly from where the battery feed connects to the main fuse box under the hood. An alternative would be to locate a constant hot wire under the dash that feeds, for instance, the interior lights and tap into that.
Use a test meter to confirm, but the wire color code I suggest you look for (reference Jeep Factory Service Manual) is either PK/GY that runs from the ignition switch or RD/DG that runs from the battery itself. The main harness runs behind the drivers side kick panel. Lots of kits for this kind of thing can be found on EBay searching for "12V Outlet".
Either way, be sure and add an inline fuse.
2010 Compass LTD Added UConnect w/IPhone cable, front/rear MOPAR mud flaps, K&N drop in air filter, hardmount gooseneck cell phone station, MOPAR cargo liner, MOPAR cargo net, remote Radar Detector w/Voltmeter readout, upgraded speakers/added Tweeters & sub-woofer, MOPAR Back-up Camera/monitor, front lower grill, interior wood accents