I'm working on backup camera and CIC carplay on oem navi screen. I'm also planning to use the relay for the power since I heard that R models are not supporting enough 12v power so It could cause flickering on the screen. I've researched which wire color is positive reverse light wire but it's all different colors depending on models. I have 2012 R58 Mini Coupe JCW with JCW body kits. Please let me know what color of wire is for reverse light!! Thank you