The images below are provided to help familiarize owners with the location of under hood components and to server as a reference resource when communicating part locations in the engine bay. Feel free to link any of these in forum, blog or social media posts. URLs are provided below with the photos and are supplied for non-commercial use.

With engine cover installed https://farm8.staticflickr.com/7438/10550085045_7a277dc1eb_o.jpg

With engine cover removed. Compared to previous generations (TJ, YJ, and CJ), there is not alot of open space in the JK engine bay.
https://farm8.staticflickr.com/7361/10549271936_c0a23dc775_o.jpg

Engine bay, viewed from front driver side https://farm3.staticflickr.com/2808/10549264866_55e6920004_o.jpg

Engine compartment, view from front passenger side https://farm3.staticflickr.com/2868/10549498123_8ea01568b8_o.jpg

Additionial Underhood References
Underhood PDC – Fuse & Relay Layout Diagram