Front Speakers wire color

All,

I want to replace the stock speakers, but do not know which one are the positive wires. I took the front/left speaker out and it has a blue and a gray wire, which one is which?

Thanks!

use a voltimeter and check them

there is only so many posibilities, maybe 2

if you look at the plugs you should see they are different sizes and shapes

the grey wire should be the neg. most of the time the more neutral the color is that is the negative. but to make sure use a voltimeter or watever they are called

blue is pos, gray is neg