I NEED HELP INSTALLING AVIC-Z2 IN TO A 2006 DODGE CHARGER RT.. IN DETAIL PLS........ SO FAR I CONNECTED ALL THE WIRES TO A FACTORY HARNES, RAN GPS INT. AND REAR POSS. WIRE (THE PURPLE ONE)........ I BUT I GET NOTTHING THE UNIT DONT EVEN LIGHT UP. IM NOT SURE IF ITS THE HARNES, MY WIRING,OR BOTH. ALSO WHATS THE SECOND FACTORY WIRES FOR (THE SMALL SET)...... AND HOW/WHERE DO I CONNECT THE LEAD WIRE(PINK ONE )FOR SPEED DETECTION. I GUESS I NEED HELP FROM STEP ONE........