Looks like you got 4 wires.
1) 12v (+) to turn on modulator.
2) two 12v supply for modulator and to charge ipod
3) two ground black cable
Ground - Black @ radio harness
Accessory - White/Red @ radio harness
Constant 12v - White/Green @ radio harness
btw, the fm modulators are often 35 - 50 dollars depending on retailer/shop. you can get blitz aux adapters for 30+ taxes. shops jack up prices to 100+ but really they are only 30 sumthing cost price.