I have a 2011 Lancer and I am trying to figure out what color wires are the rear left door speaker. Here is a picture of the wires running to the door.


If someone can tell me which one is positive and which is negative it will help me out alot

 

Why don't you pull out the speaker, then you will know the colours.

 

In my Evo x, the driver rear was yellow blue + and gray blue - the passenger was blue + and blue/white -

I found a diagram prior to doing this and it said the passenger rear was yellow/red + and gray/red - but I didn't have those wires on the passenger

If you're ever confused, use a multimeter to check the polarity. A negative value tells you the polarity is backwards when checking the volts.

If I remember correctly, if you disconnect the plug going to the door. One speaker wire was on the end of the harness and the other was on the same row, skipping a wire. So if you started at the one speaker wire calling it 1. It would be wires 1 and 3

 

Maybe this will be helpful: http://www.carstereo.com/help/carwires.cfm
Looks like a list of manufacturers and the color standards they use for speaker wires.