My Nova did not have a radio or dash speaker when I bought it. I installed a dual speaker assembly in the dash along with a hidden antenna and now need to install the AM/FM/Cassette radio. Can someone tell me which plug is the original radio plug? I have a plug near the steering column that has one yellow and one black wire. According to the wiring diagram, that should be for the radio but I remember them being larger than two wires.

The yellow is 12v + and the blck is ground. The rest of the wires would have been speakers and in a seperate harness.

I'm only going from memory on all of the 1969 Camaros I've had but I thought all of the wires (power, ground and speaker) were incorporated into one plug. It isn't a huge deal since I will still fab up a way to connect to the yellow/black plug.
Thanks.