What wire brings power from the battery to the radio?

[Rasteirinho]

Hi,

One more technical question, an electrical issue this time.

I'm trying to fit a radio to my AE86, i found that the Blue wire is ACC signal, the Green one is Taillight signal but i can't found the wire that brings power from the battery.

I have also a black and red wire but it seems it doesn't have 12v.
The remaining wires are from the speakers (4 wires) and ground wire.

I checked the radio fuse in engine compartment and it's receiving 12v.

Is the black and red wire the power source wire or is some wire missing from my car dash?

Thanks,
Pedro