Hey, I've tried looking about for information about repairing headphone plugs and I wanted to do it myself, however the wiring in the set I owned seemed ... strange. 
 
I have a Koss KSC-75 and the wires no longer made contact to the plug. I cut it off, and ordered a new plug off the internet and tried figuring out the wiring, but I still have no idea. 
 
These are the resources I looked for: 
 
http://www.head-fi.org/t/525249/broke-headphone-plug-need-help-with-replacing-it
 
http://www.head-fi.org/t/310879/ipod-headphone-jack-repair
 
http://imgur.com/a/2V6s6#3
 
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Here is what my headphone cables look like at the moment: 
 
http://i.imgur.com/VzW4fT7.jpg
 
 

 
 
.....
 
Any help/suggestions on what wire needs to go on what terminal ?
 
- Thanks for your time.

The two COPPER colour wires are GROUND (or 'return signal') so solder that to the large ground terminal.
 
The red one is VERY LIKELY the LEFT channel.
The green one is therefore likely to be the RIGHT channel. (because red is almost always left)
 
Normally instead of green, it's white.
 

steak87 said:

  http://i.imgur.com/VzW4fT7.jpg
 

Click to expand...

Also THIS TUTORIAL IS WRONG - Left and Right channels are labelled incorrectly (fourth image down).

For my reference, green is left (weird, I know). It must be attached to the top section of the core. 
 
 
EDIT: Ran out of soldering wire. Will update when supplies replenish.