Help with speaker wiring

[south21]

I purchased a 2009 cl 3 door fiesta, it came with no rear speakers so I want to add a after market set, fitting the speakers wasn't a problem but the wiring is, what I need to know is this. On the left side there are 2 wires brown with yellow stripe and white with green stripe which one is the positive one to connect to the positive side of the speaker. I found the schematics for a 2006 fiesta but the colour coding is different, thanks in advance for any help !!

p.s I haven't taken the driver side panel off yet so if anyone knows the positive wire for that side would also be great.

regards

south21

[vegabass]

I have a stab in the dark and bet the neg is the brown and yellow and the positive is the white and green.