Re: Fog LEDs: H11 LED, 6 x Cree, White - do I need resistors?
Since you have a 2015 yes you will. If you look on my OEM 2015+ SRT fog thread install you'll see what we use and recommend. 2014 models do not need them, 2015 does. I went with the Putco H11 anti-flicker module. It's 100% plug and play and has worked great for a lot of us. I got mine on eBay for pretty cheap. Just search H11 anti flicker and you'll get all sorts of options.
2015 Jeep Grand Cherokee High Altitude, Bright White, V6, HK audio