Installing Pioneer IB100II Ipod Adapter?

Question

I'm having trouble installing the power cable. I know the black wire goes to the chassis of the car, but what about the yellow wire?

Answer 1

The yellow wire is the battery wire (constant) to be connected with the same yellow wire of the head unit.

Answer 2

The yellow wire should be connected to a constant voltage source. I usually connect it to the same wire that the head unit's yellow wire is connected.