I'm lost. I connected the basic wires (red/yellow/black) from the D3 to the 70-7551 wiring harness. The harnesses have 2 pair of RCA for front and rear speakers.

 

Questions:

1. Am I to connect the D3 RCA to the radion harness?

 

2. What do I connec the Blue/White (Amp turn on) and Black/White(Amp ground) from the harness to?

 

3. Also, can I connect the D3 ground (black) to the radio harness ground instead of the vehicle metal body?

 

Thanks....