haha just trying to install a head unit I have a 7in touch screen jvc and was confused on the wiring configuration so I consulted my friends uncle and he said my only problem with wiring it up is I need a 12 volt switched source and he said there was none on the wiring harness... according to the12volt.com it leads me to beleive it would be the purple wire which they lable as the power antena, however I'm not sure and I feel there has to be another way rather than tapping into ignition.