wire change need help

[chrism84]

i have a 2007 murano....go to change speakers b/c stock ones suck....it is NOT bose system, it is a standard radio in 2007 murano.....i am not sure which wire are pos or neg....the front right had a white wire with black stripe and a green wire with black stripe........the front left had a blue wire with red stripe and a blue wire with black stripe.....the right rear had a blue and red and the left rear had a blue and red.....which ones are pos or neg???

[MaximA32]

For the left front the blue with red is the positive and the blue with black stripe is the negative. The right front is white/black is the positive and the green/black is the negative. For the rears, the red is the negative and the blue is the positive.