install a reverse camera

[jamesie s]

i have a 2008 ford focus cabriolet reverse light is in upper half of boot which makes it impossible to wire up to head unit does any one know if i could tap into reverse light wire anywhere else on the inside of car to run cable to rear and if so which wire colour would it be im guessing the wiring running under rear seat would be 1 tried a few different ways but im struggling as want to be able to use camera but also have my roof down on warm days any help or direction would be greatly appreciated tried looking for installation guides videos etc but none cover a convertible hope some1 can help thanks in advance excuse the pics and the mess