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!

 

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

 

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