2014 Nissan Maxima Stereo Wiring

Hi, I am needing to know what color is positive and negative wire from the factory amp to the rear deck speakers of my 2014 Maxima. The wire colors are left blue and yellow and right is brown and red. All four wires have some silver marks on them as well.

Since the colors you have are not matching up with the colors of the diagram provided, you may have to do it the old fashioned way. Take a 9 volt battery and solder some speaker wires to it. Make sure to get the positive wire on the positive terminal of the battery. Unplug the wires from the speaker, now take the wires you soldered to the battery and touch them to the 2 wire connections of the speakers. When the speaker moves toward the cabin of the vehicle this tells you that the positive terminal of the battery is connected to the positive speaker terminal. If the speaker moves away from the cabin, the wires are backwards. Do this with both to determine polarity.