Audio Systems: AMP addition, speaker polarity, hyundai tiburon, 2003 hyundai tiburon

Question
Sorry i forgot the car year and model...
good morning. wiring diagram of my car identify all 4 speakers by colors but
no-where it show the polarity of the wiring. Model is 2003 Hyundai tiburon GT V6 with the H280 Radio.
i'm trying to add an AMP using the rear speaker wiring as the input for the AMP
but need to figure out the polarity of the two wiring for each speaker,is there
a way i can identify for sure what wiring for each channel is the + and -? can
this be done using a volmeter?
please advise.
Thank you


Answer
wow that one is hard i don't have the instruction for your vehicle  the 1999 is the last one i have and it is
yellow/green +
yellow/black _

gren /red +
green/blue-

the best way to test is doing this

unplug the speaker and use a battery aa 1.5  or 9 volts
plug the battery to the speaker for one second  and see if the speaker moves out or in switch the polarity, when the speaker moves out the positive of the battery is the positive of the speaker, and when you plug the speaker that wire will be the positive i know it long but there is no other way
good luck