I'm adding a rear view camera. Want to hard wire rather than run supplied appliance to a cigar lighter. The sun roof and garage door opener bezel can drop down for access to a hot wire. Garage Door opener has a wire that is always hot. Good, but would run battery down. The roof switch has three terminals(c green,d Brown,e red). With a grounded test light the roof will open and close. I think this means power comes from ground. Haven't found a wire that's hot only with key on in this upper bezel area. Any thoughts? Any help appreciated.