I need to verify what colors the positive speaker wires are in the rear 06 mustang.

 

maybe here ?
https://themustangsource.com/showpos...63&postcount=1

 

Are you tapping into them for a line-out or installing speakers? If you're installing speakers I recommend these:

http://www.sonicelectronix.com/item_...a+72-5600.html

I used them when I upgraded all of my speakers; saves you from having to cut the factory stuff. The leads are "keyed" for pos and neg so you can't install them wrong.