I have a jvc kd-s26 with aux input, but when on aux mode it barley makes any noise unless cranked all the way up and definitely doesn't sound right

SOURCE: CONNECTING AN AUX CABLE TO PLAYER

Unfortunately, you can't. I have the same deck, and it has no aux in capability. The S5050 is simply a CD player, not even an MP3 player.

SOURCE: does the JVC KD-G200 have aux port?

http://www.free-service-manuals.com

Have heaps of manuals. Do a search.

SOURCE: How can i turn the aux option on on my jvc kd-g801

it's not for running your ipod or whatever else, it's for steering wheel control for those cars that have the feature. that's what it says in the manual anyway, there's gotta be a way to run the ipod through though for sure

SOURCE: I need An ownsers manual for a JVC Car stereo

http://books.jvcservice.com/Download/821574879/GET0642-001A.pdf
And, just in case, her is the installation instructions too.
http://books.jvcservice.com/Download/821574879/GET0642-002A.pdf

Testimonial: "very quick and helpful"

SOURCE: iPhone to JVC KD-S690 Cable Connection

First step: pop a huge one.