I knew this day would come...post #1 of #3 across the FABO forum...

Should only be 3 wires to power it up. One constant power which is most likely yellow. One switched power most likely red. And a black which is ground. Then you will have your speaker wire pairs which you have already taken care of. And there will be a signal wire for amps and a power antenna if you have either. It's pretty easy to do. I love my retrosound radio. I never installed the microphone for Bluetooth calls but I use Bluetooth for music from my phone. That can get annoying to get a call and have the ringtone blast through the speakers.