According to some posts I saw there is a yellow wire with purple stripe in one of the three bundles under the driver's side kick panel that switches power on and off with the car. I want to tap this with for the camera switch so there's no drain in the power when the car is off. I was able to find a yellow wire with a light grayish purple stripe but not one with a bright purple stripe. I assume the former is the switched 12v power wire? I want to know before I tap into it. Can anybody confirm?