Mazda 3 reverse light positive wire
 

Hello everyone, so in trying to install a backup camera on 2009 Mazda 3 and can't find any good info online about which wire is Positive and which is Negative, leading from the reverse lights. So I have blue, white, green, light brown and dark brown wires (see photos)..So does anyone know which is which? Don't want to play "plug and guess" game...Thanks in advance!
https://cimg4.ibsrv.net/gimg/www.maz...6ec1ec8b1f.jpg
https://cimg9.ibsrv.net/gimg/www.maz...591746ad40.jpg

Go direct to the reverse light bulb socket, use a test light and select reverse & see which wire has power.

great, thanks!

So what color is the reverse wire plz

reverse +ve wire in front footwell Mazda3 BL
 

white cable front left footwell is reverse +ve which is much easier to tap into than tailgate harness