Solved! Label green white and blue cables in an aux cord

You need multimeter for that with beeper, look up the diagram on net, and try it out.

there are 3 connectors on aux head usually
---- GROUND
-- RIGHT
- LEFT

Every other cable from qualit to quality they use different colors of wires.

If you have 1.5V battery , some cables (thin) and led you can probe also that way.