I've just installed a Pioneer Double Din AVH-3200BT head unit in my 2010 Silverado, but I'm only getting power when the lights are switched on. There are only 3 wires other than the speaker wires and ground coming out of the dash. One is 16 Gauge and Red with a white stripe. One is 18 Gauge and solid yellow. the last is 18 Gauge and solid Dark Green. Every wiring diagram I've found for a Silverado list an orange wire as being the constant 12v +, but since I didn't have that I connected the Red/White wire. Could this be my problem?